365 (three hundred ndsixty-five) is the

natural number In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country"). Numbers used for counting are called ''Cardinal n ...

following 364 and preceding 366.

Mathematics

365 is a

semiprime In mathematics, a semiprime is a natural number that is the product of exactly two prime numbers. The two primes in the product may equal each other, so the semiprimes include the squares of prime numbers. Because there are infinitely many prime nu ...

centered square number In elementary number theory, a centered square number is a centered figurate number that gives the number of dots in a square with a dot in the center and all other dots surrounding the center dot in successive square layers. That is, each cen ...

. It is also the fifth 38

-gonal number In mathematics, a polygonal number is a number represented as dots or pebbles arranged in the shape of a regular polygon. The dots are thought of as alphas (units). These are one type of 2-dimensional figurate numbers. Definition and examples ...

. For multiplication, it is calculated as

5 \times 73

. Both 5 and 73 are prime numbers. It is the smallest number that has more than one expression as a sum of consecutive

square number In mathematics, a square number or perfect square is an integer that is the square (algebra), square of an integer; in other words, it is the multiplication, product of some integer with itself. For example, 9 is a square number, since it equals ...

s: :

365 = 13^2 + 14^2

365 = 10^2 + 11^2 + 12^2

There are no known primes with period 365, while at least one prime with each of the periods 1 to 364 is known.

Timekeeping

There are 365.2422

solar day A synodic day (or synodic rotation period or solar day) is the period for a celestial object to rotate once in relation to the star it is orbiting, and is the basis of solar time. The synodic day is distinguished from the sidereal day, which is ...

s in the

mean tropical year A tropical year or solar year (or tropical period) is the time that the Sun takes to return to the same position in the sky of a celestial body of the Solar System such as the Earth, completing a full cycle of seasons; for example, the time f ...

. Several

solar calendar A solar calendar is a calendar whose dates indicate the season or almost equivalently the apparent position of the Sun relative to the stars. The Gregorian calendar, widely accepted as a standard in the world, is an example of a solar calendar. T ...

s have a year containing 365 days. Related to this, in

Ontario Ontario ( ; ) is one of the thirteen provinces and territories of Canada.Ontario is located in the geographic eastern half of Canada, but it has historically and politically been considered to be part of Central Canada. Located in Central Ca ...

, the

driver's license A driver's license is a legal authorization, or the official document confirming such an authorization, for a specific individual to operate one or more types of motorized vehicles—such as motorcycles, cars, trucks, or buses—on a public ...

learner's permit used to be called "365" because it was valid for only 366 days. Financial and scientific calculations often use a 365-day calendar to simplify daily rates.

Religious meanings

Judeo-Christian

In the

Jewish Jews ( he, יְהוּדִים, , ) or Jewish people are an ethnoreligious group and nation originating from the Israelites Israelite origins and kingdom: "The first act in the long drama of Jewish history is the age of the Israelites""The ...

faith there are 365 " negative commandments". Also, the Bible states that

Enoch Enoch () ''Henṓkh''; ar, أَخْنُوخ ', Qur'ān.html"_;"title="ommonly_in_Qur'ān">ommonly_in_Qur'ānic_literature__'_is_a_biblical_figure_and_Patriarchs_(Bible).html" "title="Qur'ānic_literature.html" ;"title="Qur'ān.html" ;"title="o ...

lived for 365 years before

entering heaven alive Entering heaven alive (called by various religions "ascension", "assumption", or "translation") is a belief held in various religions. Since death is the normal end to an individual's life on Earth and the beginning of afterlife, entering hea ...

(see ).

Gnosticism

The letters of the deity

Abraxas Abraxas ( grc-x-biblical, ἀβραξάς, abraxas, variant form romanized: ) is a word of mystic meaning in the system of the Gnostic Basilides, being there applied to the "Great Archon" (), the princeps of the 365 spheres (). The word is foun ...

, in the

Greek Greek may refer to: Greece Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group. *Greek language, a branch of the Indo-European language family. **Proto-Greek language, the assumed last common ancestor ...

notation, make up the number 365. This number was subsequently viewed as signifying the levels of

heaven Heaven or the heavens, is a common religious cosmological or transcendent supernatural place where beings such as deities, angels, souls, saints, or venerated ancestors are said to originate, be enthroned, or reside. According to the belie ...

References

{{Integers, 3 Integers