1809

1,809 is an odd composite number composed of two prime numbers multiplied together.

What does the number 1809 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 8 divisors.

1809 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 1809:

33 × 67

(3 × 3 × 3 × 67)

See below for interesting mathematical facts about the number 1809 from the Numbermatics database.


Names of 1809

  • Cardinal: 1809 can be written as One thousand, eight hundred nine.

Scientific notation

  • Scientific notation: 1.809 × 103

Factors of 1809

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 4
  • Sum of prime factors: 70

Divisors of 1809

  • Number of divisors d(n): 8
  • Complete list of divisors:
  • Sum of all divisors σ(n): 2720
  • Sum of proper divisors (its aliquot sum) s(n): 911
  • 1809 is a deficient number, because the sum of its proper divisors (911) is less than itself. Its deficiency is 898

Bases of 1809

  • Binary: 111000100012
  • Hexadecimal: 0x711
  • Base-36: 1E9

Squares and roots of 1809

  • 1809 squared (18092) is 3272481
  • 1809 cubed (18093) is 5919918129
  • The square root of 1809 is 42.5323406363
  • The cube root of 1809 is 12.1846443013

Scales and comparisons

How big is 1809?
  • 1,809 seconds is equal to 30 minutes, 9 seconds.
  • To count from 1 to 1,809 would take you about thirty 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 1809 cubic inches would be around 1 feet tall.

Recreational maths with 1809

  • 1809 backwards is 9081
  • The number of decimal digits it has is: 4
  • The sum of 1809's digits is 18
  • More coming soon!

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"Number 1809 - Facts about the integer". Numbermatics.com. 2021. Web. 6 March 2021.

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Numbermatics. (2021). Number 1809 - Facts about the integer. Retrieved 6 March 2021, from https://numbermatics.com/n/1809/

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The information we have on file for 1809 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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