15917138 has 16 divisors (see below), whose sum is σ = 24852960. Its totient is φ = 7639296.

The previous prime is 15917137. The next prime is 15917147. The reversal of 15917138 is 83171951.

It is a super-2 number, since 2×15917138² = 506710564222088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15917098 and 15917107.

It is not an unprimeable number, because it can be changed into a prime (15917137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3506 + ... + 6642.

It is an arithmetic number, because the mean of its divisors is an integer number (1553310).

Almost surely, 2^15917138 is an apocalyptic number.

15917138 is a deficient number, since it is larger than the sum of its proper divisors (8935822).

15917138 is a wasteful number, since it uses less digits than its factorization.

15917138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3241.

The product of its digits is 7560, while the sum is 35.

The square root of 15917138 is about 3989.6288047887. The cubic root of 15917138 is about 251.5484586353.

The spelling of 15917138 in words is "fifteen million, nine hundred seventeen thousand, one hundred thirty-eight".