40

40 is an even composite number composed of two prime numbers multiplied together.

What does the number 40 look like?

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

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

Prime factorization of 40:

23 × 5

(2 × 2 × 2 × 5)

See below for interesting mathematical facts about the number 40 from the Numbermatics database.


Names of 40

  • Cardinal: 40 can be written as Forty.

Scientific notation

  • Scientific notation: 4 × 101

Factors of 40

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 4
  • Sum of prime factors: 7

Divisors of 40

  • Number of divisors d(n): 8
  • Complete list of divisors:
    1 2 4 5 8 10 20 40
  • Sum of all divisors σ(n): 90
  • Sum of proper divisors (its aliquot sum) s(n): 50
  • 40 is an abundant number, because the sum of its proper divisors (50) is greater than itself. Its abundance is 10

Bases of 40

  • Binary: 1010002
  • Hexadecimal: 0x28
  • Base-36: 14

Squares and roots of 40

  • 40 squared (402) is 1600
  • 40 cubed (403) is 64000
  • The square root of 40 is 6.3245553203
  • The cube root of 40 is 3.4199518931

Scales and comparisons

How big is 40?
  • A cube with a volume of 40 cubic inches would be around 0.3 feet tall.

Recreational maths with 40

  • 40 backwards is 04
  • 40 is a Harshad number.
  • The number of decimal digits it has is: 2
  • The sum of 40's digits is 4
  • 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 40 - Facts about the integer". Numbermatics.com. 2024. Web. 19 March 2024.

APA style:
Numbermatics. (2024). Number 40 - Facts about the integer. Retrieved 19 March 2024, from https://numbermatics.com/n/40/

Chicago style:
Numbermatics. 2024. "Number 40 - Facts about the integer". https://numbermatics.com/n/40/

The information we have on file for 40 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 40, math, Factors of 40, curriculum, school, college, exams, university, Prime factorization of 40, STEM, science, technology, engineering, physics, economics, calculator, forty.

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