865

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

What does the number 865 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 4 divisors.

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

Prime factorization of 865:

5 × 173

See below for interesting mathematical facts about the number 865 from the Numbermatics database.


Names of 865

  • Cardinal: 865 can be written as Eight hundred sixty-five.

Scientific notation

  • Scientific notation: 8.65 × 102

Factors of 865

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 2
  • Sum of prime factors: 178

Divisors of 865

  • Number of divisors d(n): 4
  • Complete list of divisors:
  • Sum of all divisors σ(n): 1044
  • Sum of proper divisors (its aliquot sum) s(n): 179
  • 865 is a deficient number, because the sum of its proper divisors (179) is less than itself. Its deficiency is 686

Bases of 865

  • Binary: 11011000012
  • Hexadecimal: 0x361
  • Base-36: O1

Squares and roots of 865

  • 865 squared (8652) is 748225
  • 865 cubed (8653) is 647214625
  • The square root of 865 is 29.4108823397
  • The cube root of 865 is 9.5280794345

Scales and comparisons

How big is 865?
  • 865 seconds is equal to 14 minutes, 25 seconds.
  • To count from 1 to 865 would take you about seven 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 865 cubic inches would be around 0.8 feet tall.

Recreational maths with 865

  • 865 backwards is 568
  • The number of decimal digits it has is: 3
  • The sum of 865's digits is 19
  • More coming soon!

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The information we have on file for 865 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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