1287

1,287 is an odd composite number composed of three prime numbers multiplied together.

What does the number 1287 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 12 divisors.

1287 is an odd composite number. It is composed of three distinct prime numbers multiplied together. It has a total of twelve divisors.

Prime factorization of 1287:

32 × 11 × 13

(3 × 3 × 11 × 13)

See below for interesting mathematical facts about the number 1287 from the Numbermatics database.


Names of 1287

  • Cardinal: 1287 can be written as One thousand, two hundred eighty-seven.

Scientific notation

  • Scientific notation: 1.287 × 103

Factors of 1287

  • Number of distinct prime factors ω(n): 3
  • Total number of prime factors Ω(n): 4
  • Sum of prime factors: 27

Divisors of 1287

  • Number of divisors d(n): 12
  • Complete list of divisors:
  • Sum of all divisors σ(n): 2184
  • Sum of proper divisors (its aliquot sum) s(n): 897
  • 1287 is a deficient number, because the sum of its proper divisors (897) is less than itself. Its deficiency is 390

Bases of 1287

  • Binary: 101000001112
  • Hexadecimal: 0x507
  • Base-36: ZR

Squares and roots of 1287

  • 1287 squared (12872) is 1656369
  • 1287 cubed (12873) is 2131746903
  • The square root of 1287 is 35.8747822293
  • The cube root of 1287 is 10.8774271237

Scales and comparisons

How big is 1287?
  • 1,287 seconds is equal to 21 minutes, 27 seconds.
  • To count from 1 to 1,287 would take you about twenty-one 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. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

  • A cube with a volume of 1287 cubic inches would be around 0.9 feet tall.

Recreational maths with 1287

  • 1287 backwards is 7821
  • The number of decimal digits it has is: 4
  • The sum of 1287's digits is 18
  • More coming soon!

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The information we have on file for 1287 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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