



Number 15

fifteen

Properties of the number 15

Factorization 

3 * 5

Divisors 
1, 3, 5, 15

Count of divisors 
4

Sum of divisors 
24

Previous integer 
14 
Next integer 
16 
Is prime? 
NO

Previous prime 
13

Next prime 
17

15th prime 
47

Is a Fibonacci number? 
NO

Is a Bell number? 
YES B_{4}

Is a Catalan number? 
NO

Is a factorial? 
NO

Is a regular number? 
YES

Is a perfect number? 
NO

Polygonal number (s < 11)? 
triangular(5), hexagonal(3) 
Binary 
1111 
Octal 
17 
Duodecimal 
13 
Hexadecimal 
f 
Square 
225 
Square root 
3.8729833462074 
Natural logarithm 
2.7080502011022 
Decimal logarithm 
1.1760912590557 
Sine 
0.65028784015712 
Cosine 
0.75968791285882 
Tangent 
0.85599340090852 

Number 15 is pronounced fifteen.
Number 15 is a composite number.
Factors of 15 are 3 * 5.
Number 15 has 4 divisors: 1, 3, 5, 15.
Sum of the divisors is 24.
Number 15 is not a Fibonacci number.
It is a Bell number.
Number 15 is not a Catalan number.
Number 15 is a regular number (Hamming number).
It is a not factorial of any number.
Number 15 is a deficient number and therefore is not a perfect number.
Number 15 is a triangular number with n=5 and a hexagonal number with n=3.
Binary numeral for number 15 is 1111.
Octal numeral is 17.
Duodecimal value is 13.
Hexadecimal representation is f.
Square of the number 15 is 225.
Square root of the number 15 is 3.8729833462074.
Natural logarithm of 15 is 2.7080502011022
Decimal logarithm of the number 15 is 1.1760912590557
Sine of 15 is 0.65028784015712. Cosine of the number 15 is 0.75968791285882. Tangent of the number 15 is 0.85599340090852



Math tools for your website


Choose language:
Deutsch
English
Español
Français
Italiano
Nederlands
Polski
Português
Русский
中文
日本語
한국어




Number Empire  powerful math tools for everyone  Contact webmaster


By using this website, you signify your acceptance of Terms and Conditions and Privacy Policy.
© 2021
numberempire.com
All rights reserved


