4000 or ''variation'', may refer to: *

4000 (number) 4000 (four thousand) is the natural number following 3000 (number)#3900 to 3999, 3999 and preceding 4001. It is a decagonal number. Selected numbers in the range 4001–4999 4001 to 4099 * 4005 – triangular number * 4007 – safe prime * 401 ...

4000 BCE 4 (four) is a number, numeral and digit. It is the natural number following 3 and preceding 5. It is the smallest semiprime and composite number, and is considered unlucky in many East Asian cultures. In mathematics Four is the smallest c ...

, a year in the 4th millennium BC * A.D. 4000, the last year of the

4th millennium While the future cannot be predicted with certainty, present understanding in various scientific fields allows for the prediction of some far-future events, if only in the broadest outline. These fields include astrophysics, which studies ho ...

CE, a century leap year starting on Saturday * 4000s AD, a decade, century, millennium in the

5th millennium While the future cannot be predicted with certainty, present understanding in various scientific fields allows for the prediction of some far-future events, if only in the broadest outline. These fields include astrophysics, which studies how ...

CE * 4000s BCE, a decade, century, millennium in the

5th millennium BC The 5th millennium BC spanned the years 5000 BC to 4001 BC (c. 7 ka to c. 6 ka). It is impossible to precisely date events that happened around the time of this millennium and all dates mentioned here are estimates mostly based on geological an ...

4000 Hipparchus 4000 Hipparchus is a dark background asteroid from the central regions of the asteroid belt, approximately in diameter. It was discovered on 4 January 1989, by Japanese astronomers Seiji Ueda and Hiroshi Kaneda at the Kushiro Observatory on H ...

, an asteroid in the Asteroid Belt, the 4000th asteroid registered *

Mobro 4000 The ''Mobro 4000'' was a barge owned by MOBRO Marine, Inc. made infamous in 1987 for hauling the same load of trash along the east coast of North America from New York City to Belize and back until a way was found to dispose of the garbage. During ...

, a barge operated by MOBRO *

Weather Star 4000 WeatherStar (sometimes rendered Weather Star or WeatherSTAR; "STAR" being an acronym for Satellite Transponder Addressable Receiver) is the technology used by American cable and satellite television network The Weather Channel (TWC) to generate it ...

, a computer system used to display local forecasts on The Weather Channel *

Hawker 4000 The Hawker 4000, originally known as the Hawker Horizon, is a super-midsize business jet developed by Hawker Beechcraft (formerly Raytheon Aircraft Company). Development Raytheon announced a new business jet in November 1996 as a larger aircr ...

, a supermidsized businessjet *

Delta 4000 The Delta 4000 series was an American expendable launch system which was used to conduct two orbital launches in 1989 and 1990. It was a member of the Delta family of rockets. Although several variants were put forward, only the Delta 4925 was la ...

, a rocket series * Audi 4000, a compact executive sedan * 4000 (District of Shkodër), one of the

postal codes in Albania Postal Codes in Albania consist of 4 digits; the first two digits show the branch on a district level located at the center of that administrative level, whereas the second two digits show the postal office offering service to a defined administrati ...

4000-series integrated circuits The 4000 series is a CMOS logic family of integrated circuits (ICs) first introduced in 1968 by RCA. It had a supply voltage range of 5V to 20V, which is much wider than any contemporary logic family. Almost all IC manufacturers active during thi ...

See also