7 (number)

7 (seven) is the natural number following 6 and preceding 8.

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The SI prefix for 10007 is zetta (Z), and for its reciprocal zepto (z).

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Seven is the fourth-smallest prime number; the next is 11. Seven is a Mersenne prime, since 23 - 1 = 7. Seven is also the fourth Mersenne prime exponent, the first Newman-Shanks-Williams prime, the third Lucas prime, and the first Woodall prime. 7 is also the second lucky prime, the second safe prime, and the fourth factorial prime. 7 is the smallest number that can't be represented as a sum of fewer than four nonzero squares. 7 is also a self number.

Natural number: Natural number can mean either a positive integer (, , , , ...) or a non-negative integer (, , , , , ...)....

6:   This article is about the year 6. For other uses of 6, see 6 (number)....

8:   This article is about the year 8. For other uses of 8, see 8 (number)....

7 (number) related Images and Photos (experimental)

Number 8 1949	Number 36	Number 23	Number 25
Number 23 (BD)	Number 18 1950	ABBA: Number Ones CD	ABBA: Number Ones CD
Number 23, The (DVD) (WS) (Rated/Unrated)	Summertime: Number 9A 1948	Tree Number Two	Gangster Number 1