15

15 is an odd composite number composed of two prime numbers multiplied together.

What does the number 15 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 4 divisors.

15 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of four divisors.

Prime factorization of 15:

3 × 5

See below for interesting mathematical facts about the number 15 from the Numbermatics database.

Names of 15

Cardinal: 15 can be written as Fifteen.

Scientific notation

Scientific notation: 1.5 × 10¹

Factors of 15

Number of distinct prime factors ω(n): 2
Total number of prime factors Ω(n): 2
Sum of prime factors: 8

Divisors of 15

Number of divisors d(n): 4
Complete list of divisors:
1 3 5 15
Sum of all divisors σ(n): 24
Sum of proper divisors (its aliquot sum) s(n): 9
15 is a deficient number, because the sum of its proper divisors (9) is less than itself. Its deficiency is 6

Bases of 15

Binary: 1111₂
Hexadecimal: 0xF
Base-36: F

Squares and roots of 15

15 squared (15²) is 225
15 cubed (15³) is 3375
The square root of 15 is 3.8729833463
The cube root of 15 is 2.4662120743

Scales and comparisons

How big is 15?

A cube with a volume of 15 cubic inches would be around 0.2 feet tall.

Recreational maths with 15

15 backwards is 51
The number of decimal digits it has is: 2
The sum of 15's digits is 6
More coming soon!

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The information we have on file for 15 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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