999 is an odd composite number composed of two prime numbers multiplied together.

999 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of eight divisors.

Prime factorization of 999:

33 × 37

(3 × 3 × 3 × 37)

See below for interesting mathematical facts about the number 999 from the Numbermatics database.

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Names Factors Divisors Scales Roots Fun

Names of 999

  • Cardinal: 999 can be written as Nine hundred ninety-nine.

Scientific notation

  • Scientific notation: 9.99 × 102

Factors of 999

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 4
  • Sum of prime factors: 40

Divisors of 999

  • Number of divisors d(n): 8
  • Complete list of divisors:
  • Sum of all divisors σ(n): 1520
  • Sum of proper divisors (its aliquot sum) s(n): 521
  • 999 is a deficient number, because the sum of its proper divisors (521) is less than itself. Its deficiency is 478

Bases of 999

  • Binary: 1111100111 2
  • Hexadecimal: 0x3e7

Squares and roots of 999

  • 999 squared (9992) is 998001
  • 999 cubed (9993) is 997002999
  • The square root of 999 is 31.6069612585
  • The cube root of 999 is 9.9966655549

Scales and comparisons

How big is 999?
  • 999 seconds is equal to 16 minutes, 39 seconds.
  • To count from 1 to 999 would take you about eight minutes.

    This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000.

    Note: we do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!

  • A cube with a volume of 999 cubic inches would be around 0.8 feet tall.

Recreational maths with 999

  • 999 is the same when its digits are reversed! That makes it a palindromic number.
  • 999 is a Harshad number.
  • The number of decimal digits it has is: 3
  • The sum of 999's digits is 27
  • More coming soon!

The information we have on file for 999 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!

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