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  1

  1 (one) is a number, numeral, and the name of the glyph representing that number. It represents a single entity, the unit of counting or measurement. For example, a line segment of "unit length" is a line segment of length 1. One is the integer before two and after zero. One is the first non-zero...
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  0

  0 (zero) is both a number and the numerical digit used to represent that number in numerals. It plays a central role in mathematics as the additive identity of the integers, real numbers, and many other algebraic structures. As a digit, zero is used as a placeholder in place value systems. In the...
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  2

  2 (two) (pronounced /ˈtuː/ ( listen)) is a number, numeral, and glyph. It is the natural number following 1 and preceding 3. Two has many properties in mathematics. An integer is called even if it is divisible by 2. For integers written in a numeral system based on an even number, such as decimal...
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  9

  9 (nine) is the natural number following 8 and preceding 10. The ordinal adjective is ninth. Nine is a composite number, its proper divisors being 1 and 3. It is 3 times 3 and hence the third square number. 9 is a Motzkin number. It is the first composite lucky number. Nine is the highest single...
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  10

  10 (ten) (pronounced /ˈtɛn/ ( listen)) is an even natural number following 9 and preceding 11. 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...
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  11

  11 (eleven) (pronounced /ɨˈlɛvɨn/ ( listen) or /iːˈlɛvɛn/) is the natural number following 10 and preceding 12. It is the first number which cannot be represented by a human counting his or her eight fingers and two thumbs additively. Eleven is the smallest positive integer requiring three...
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  3

  3 (three) is a number, numeral, and glyph. It is the natural number following 2 and preceding 4. Three is the first odd prime number, and the second smallest prime. It is both the first Fermat prime (2 + 1) and the first Mersenne prime (2 − 1), as well as the first lucky prime. However, it's the...
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  7

  7 (seven) is the natural number following 6 and preceding 8. It is the smallest positive integer to be spoken with two syllables when pronounced in English. It is also said to be a lucky number. In quaternary, 7 is the smallest prime with a composite sum of digits. In the beginning, various Hindus...
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  4

  4 (four) is a number, numeral, and glyph. It is the natural number following 3 and preceding 5. Four is the smallest composite number, its proper divisors being 1 and 2. Four is also a highly composite number. The next highly composite number is 6. Four is the second square number, the second...
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  6

  6 (six) is the natural number following 5 and preceding 7. The SI prefix for 1000 is exa (E), and for its reciprocal atto (a). Six is the second smallest composite number, its proper divisors being 1, 2 and 3. Since six equals the sum of these proper divisors, six is the smallest perfect number. As...