18981

18,981 is an odd composite number composed of three prime numbers multiplied together.

What does the number 18981 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 16 divisors.

18981 is an odd composite number. It is composed of three distinct prime numbers multiplied together. It has a total of sixteen divisors.

Prime factorization of 18981:

33 × 19 × 37

(3 × 3 × 3 × 19 × 37)

See below for interesting mathematical facts about the number 18981 from the Numbermatics database.


Names of 18981

  • Cardinal: 18981 can be written as Eighteen thousand, nine hundred eighty-one.

Scientific notation

  • Scientific notation: 1.8981 × 104

Factors of 18981

  • Number of distinct prime factors ω(n): 3
  • Total number of prime factors Ω(n): 5
  • Sum of prime factors: 59

Divisors of 18981

  • Number of divisors d(n): 16
  • Complete list of divisors:
  • Sum of all divisors σ(n): 30400
  • Sum of proper divisors (its aliquot sum) s(n): 11419
  • 18981 is a deficient number, because the sum of its proper divisors (11419) is less than itself. Its deficiency is 7562

Bases of 18981

  • Binary: 1001010001001012
  • Hexadecimal: 0x4A25
  • Base-36: EN9

Squares and roots of 18981

  • 18981 squared (189812) is 360278361
  • 18981 cubed (189813) is 6838443570141
  • The square root of 18981 is 137.7715500385
  • The cube root of 18981 is 26.6751188485

Scales and comparisons

How big is 18981?
  • 18,981 seconds is equal to 5 hours, 16 minutes, 21 seconds.
  • To count from 1 to 18,981 would take you about five hours.

    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 18981 cubic inches would be around 2.2 feet tall.

Recreational maths with 18981

  • 18981 is the same when its digits are reversed! That makes it a palindromic number.
  • 18981 is a Harshad number.
  • The number of decimal digits it has is: 5
  • The sum of 18981's digits is 27
  • More coming soon!

Copy this link to share with anyone:


Share this page on social media:

Link to this page

HTML: To link to this page, just copy and paste the link below into your blog, web page or email.

BBCODE: To link to this page in a forum post or comment box, just copy and paste the link code below:

Cite this page

MLA style:
"Number 18981 - Facts about the integer". Numbermatics.com. 2024. Web. 29 March 2024.

APA style:
Numbermatics. (2024). Number 18981 - Facts about the integer. Retrieved 29 March 2024, from https://numbermatics.com/n/18981/

Chicago style:
Numbermatics. 2024. "Number 18981 - Facts about the integer". https://numbermatics.com/n/18981/

The information we have on file for 18981 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 18981, math, Factors of 18981, curriculum, school, college, exams, university, Prime factorization of 18981, STEM, science, technology, engineering, physics, economics, calculator, eighteen thousand, nine hundred eighty-one.

Oh no. Javascript is switched off in your browser.
Some bits of this website may not work unless you switch it on.