200 (two hundred) is the
natural number
In mathematics, the natural numbers are the numbers 0, 1, 2, 3, and so on, possibly excluding 0. Some start counting with 0, defining the natural numbers as the non-negative integers , while others start with 1, defining them as the positive in ...
following
199 and preceding
201.
In mathematics
200 is an
abundant number, as 265, the sum of its
proper divisors, is greater than itself.
The number appears in the
Padovan sequence, preceded by
86,
114, and
151 (it is the sum of the first two of these).
The sum of
Euler's totient function
In number theory, Euler's totient function counts the positive integers up to a given integer that are relatively prime to . It is written using the Greek letter phi as \varphi(n) or \phi(n), and may also be called Euler's phi function. In ot ...
φ(''x'') over the first twenty-five integers is 200.
200 is the smallest base 10 unprimeable number – it cannot be turned into a prime number by changing just one of its digits to any other digit. It is also a
Harshad number.
200 is an
Achilles number.
References
{{DEFAULTSORT:200 (Number)
Integers