15,987 is an odd composite number composed of two prime numbers multiplied together.

What does the number 15987 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 6 divisors.

15987 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of six divisors.

Prime factorization of 15987:

3 × 732

(3 × 73 × 73)

See below for interesting mathematical facts about the number 15987 from the Numbermatics database.

Names of 15987

  • Cardinal: 15987 can be written as Fifteen thousand, nine hundred eighty-seven.

Scientific notation

  • Scientific notation: 1.5987 × 104

Factors of 15987

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 3
  • Sum of prime factors: 76

Divisors of 15987

  • Number of divisors d(n): 6
  • Complete list of divisors:
  • Sum of all divisors σ(n): 21612
  • Sum of proper divisors (its aliquot sum) s(n): 5625
  • 15987 is a deficient number, because the sum of its proper divisors (5625) is less than itself. Its deficiency is 10362

Bases of 15987

  • Binary: 111110011100112
  • Hexadecimal: 0x3E73
  • Base-36: CC3

Squares and roots of 15987

  • 15987 squared (159872) is 255584169
  • 15987 cubed (159873) is 4086024109803
  • The square root of 15987 is 126.4397089525
  • The cube root of 15987 is 25.1915945763

Scales and comparisons

How big is 15987?
  • 15,987 seconds is equal to 4 hours, 26 minutes, 27 seconds.
  • To count from 1 to 15,987 would take you about four hours.

    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. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

  • A cube with a volume of 15987 cubic inches would be around 2.1 feet tall.

Recreational maths with 15987

  • 15987 backwards is 78951
  • The number of decimal digits it has is: 5
  • The sum of 15987's digits is 30
  • More coming soon!

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The information we have on file for 15987 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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