# 15

6

4

24

15 = 3 × 5

Factor Count
3 1
5 1

225

3375

## Square root of 15

3.87298334620741702138957407441922...

## Cube root of 15

2.46621207433046985002533801889513...

120

## Reciprocal of 15

0.0666666666666667

1111

4

## Octal of 15

17

f

 Prime number No Hexagonal number Yes Perfect number No Deficient number No Abundant number No Mersenne number Yes Harshad number No Harmonic divisor number No

QR15 (sequence)

25

8

4

1

## Properties of 15

Properties of the number 15: 15 has 4 divisors. The divisors of 15 are 1, 3, 5, 15 and the sum of them is 24. The factorization of 15 is 3 × 5. The square and cube of 15 are 225 and 3375 respectively. The square root and cube root of 15 are 3.87298334620741702138957407441922... and 2.46621207433046985002533801889513.... The binary, octal, hexadecimal of 15 are 1111, 17, f. 15 is not a prime number, hexagonal number, not perfect number, not deficient number, not Mersenne number, Mersenne number, not Harshad number, not harmonic divisor number.

## sin 15

0.65028784015711682542359994840808...

## cos 15

-0.75968791285882131258944127694122...

## tan 15

-0.85599340090851872009380940653500...

## sin 15°

0.25881904510252073947640383266844...

## cos 15°

0.96592582628906831221371476203785...

## tan 15°

0.26794919243112269580109341404750...

## log 15

2.70805020110221006390816000930499...

## log10 15

1.17609125905568134839995764195919...

## log2 15

3.90689059560851870145370412501507...