1,686 is an even composite number composed of three prime numbers multiplied together.

What does the number 1686 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 8 divisors.

1686 is an even composite number. It is composed of three distinct prime numbers multiplied together. It has a total of eight divisors.

Prime factorization of 1686:

2 × 3 × 281

See below for interesting mathematical facts about the number 1686 from the Numbermatics database.

Names of 1686

  • Cardinal: 1686 can be written as One thousand, six hundred eighty-six.

Scientific notation

  • Scientific notation: 1.686 × 103

Factors of 1686

  • Number of distinct prime factors ω(n): 3
  • Total number of prime factors Ω(n): 3
  • Sum of prime factors: 286

Divisors of 1686

  • Number of divisors d(n): 8
  • Complete list of divisors:
  • Sum of all divisors σ(n): 3384
  • Sum of proper divisors (its aliquot sum) s(n): 1698
  • 1686 is an abundant number, because the sum of its proper divisors (1698) is greater than itself. Its abundance is 12

Bases of 1686

  • Binary: 110100101102
  • Hexadecimal: 0x696
  • Base-36: 1AU

Squares and roots of 1686

  • 1686 squared (16862) is 2842596
  • 1686 cubed (16863) is 4792616856
  • The square root of 1686 is 41.0609303353
  • The cube root of 1686 is 11.9019792861

Scales and comparisons

How big is 1686?
  • 1,686 seconds is equal to 28 minutes, 6 seconds.
  • To count from 1 to 1,686 would take you about twenty-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. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

  • A cube with a volume of 1686 cubic inches would be around 1 feet tall.

Recreational maths with 1686

  • 1686 backwards is 6861
  • The number of decimal digits it has is: 4
  • The sum of 1686's digits is 21
  • More coming soon!

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The information we have on file for 1686 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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