1805

1,805 is an odd composite number composed of two prime numbers multiplied together.

What does the number 1805 look like?

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

1805 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 1805:

5 × 192

(5 × 19 × 19)

See below for interesting mathematical facts about the number 1805 from the Numbermatics database.


Names of 1805

  • Cardinal: 1805 can be written as One thousand, eight hundred five.

Scientific notation

  • Scientific notation: 1.805 × 103

Factors of 1805

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 3
  • Sum of prime factors: 24

Divisors of 1805

  • Number of divisors d(n): 6
  • Complete list of divisors:
  • Sum of all divisors σ(n): 2286
  • Sum of proper divisors (its aliquot sum) s(n): 481
  • 1805 is a deficient number, because the sum of its proper divisors (481) is less than itself. Its deficiency is 1324

Bases of 1805

  • Binary: 111000011012
  • Hexadecimal: 0x70D
  • Base-36: 1E5

Squares and roots of 1805

  • 1805 squared (18052) is 3258025
  • 1805 cubed (18053) is 5880735125
  • The square root of 1805 is 42.4852915725
  • The cube root of 1805 is 12.1756569153

Scales and comparisons

How big is 1805?
  • 1,805 seconds is equal to 30 minutes, 5 seconds.
  • To count from 1 to 1,805 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 1805 cubic inches would be around 1 feet tall.

Recreational maths with 1805

  • 1805 backwards is 5081
  • The number of decimal digits it has is: 4
  • The sum of 1805's digits is 14
  • More coming soon!

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"Number 1805 - Facts about the integer". Numbermatics.com. 2021. Web. 9 December 2021.

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Numbermatics. (2021). Number 1805 - Facts about the integer. Retrieved 9 December 2021, from https://numbermatics.com/n/1805/

Chicago style:
Numbermatics. 2021. "Number 1805 - Facts about the integer". https://numbermatics.com/n/1805/

The information we have on file for 1805 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!

Keywords: Divisors of 1805, math, Factors of 1805, curriculum, school, college, exams, university, Prime factorization of 1805, STEM, science, technology, engineering, physics, economics, calculator, one thousand, eight hundred five.

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