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10 (ten ) is an even natural number following 9 and preceding 11. Ten is the base of the decimal numeral system, by far the most common system of denoting numbers in both spoken and written language. The reason for the choice of ten is assumed to be that humans have ten fingers (digits).
Ten is a composite number, its proper divisors being 1, 2 and 5. Ten is the smallest noncototient, a number that cannot be expressed as the difference between any integer and the total number of coprimes below it.
Ten is the second discrete semiprime (2.5) and the second member of the (2.q) discrete semiprime family. Ten has an aliquot sum σ(n) of 8 and is accordingly the first discrete semiprime to be in deficit. All subsequent discrete semiprimes are in deficit. The aliquot sequence for 10 comprises five members (10,8,7,1,0) with this number being the second composite member of the 7-aliquot tree.
Ten is the smallest semiprime that is the sum of all the distinct prime numbers from its lower factor through its higher factor (10 = 2 + 3 + 5 = 2 . 5) Only three other small semiprimes (39, 155, and 371) share this attribute.
It is the aliquot sum of only one number the discrete semiprime 14.
Ten is a semi-meandric number.
Ten is the sum of the first three prime numbers, of the four first numbers (1 + 2 + 3 + 4), of the square of the two first odd numbers and also of the first four factorials (0! + 1! + 2! + 3!). Ten is the eighth Perrin number, preceded in the sequence by 5, 5, 7.
A polygon with ten sides is a decagon, and 10 is a decagonal number. Because 10 is the product of a power of 2 (namely 21) with nothing but distinct Fermat primes (specifically 5), a regular decagon is a constructible polygon.
Ten is also a triangular number, a centered triangular number, and a tetrahedral number.
Ten is the number of n-Queens Problem solutions for n = 5.
Ten is the smallest number whose status as a possible friendly number is unknown.
As is the case for any base in its system, ten is the first two-digit number in decimal and thus the lowest number where the position of a numeral affects its value. Any integer written in the decimal system can be multiplied by ten by adding a zero to the end (e.g. 855 * 10 = 8550).
The Roman numeral for ten is X (which looks like two V's [the Roman numeral for 5] put together); it is thought that the V for five is derived from an open hand (five digits displayed), and X for ten from both hands. Incidentally, the Chinese word numeral for ten, is also a cross: 十.
The digit '1' followed by '0' is how the value of p is written in base p. (E.g. 16 in hexadecimal is 10.)
Properties:
The SI prefix for 10 is "deca-".
The meaning "10" is part of the following terms:
Also, the number 10 plays a role in the following:
Most countries issue coins and bills with a denomination of 10 (See e.g. 10 dollar note). Of these, the dime, with the value of ten cents, or one tenth of a dollar, derives its name from the meaning "one-tenth" - see Dime (United States coin)#Denomination history and etymology.
The jersey number 10 has been retired by several North American sports teams in honor of past playing greats or other key figures, including Major League Baseball, the NBA, the NFL, and the NHL.
Ten is:
Development of the Christian biblical canon, Antilegomena, Development of the Hebrew Bible canon
O, 1 (number), Computer science, 2 (number), Hinduism
Espn2, The Walt Disney Company, ESPN on ABC, Hearst Corporation, American Broadcasting Company
Espn, Connecticut, The Walt Disney Company, Hearst Corporation, United States
Hindu astrology, Asia, Ancient Rome, Renaissance, Dante Alighieri
Association football, 10 (number), 0 (number), Duodecimal, Hexadecimal
0 (number), 3 (number), Pinyin, Latin, Yoga
3 (number), Ten Commandments, 1 (number), 0 (number), 4 (number)