15997475 has 12 divisors (see below), whose sum is σ = 21363216. Its totient is φ = 11813280.

The previous prime is 15997469. The next prime is 15997477. The reversal of 15997475 is 57479951.

It is not a de Polignac number, because 15997475 - 2¹⁸ = 15735331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15997477) 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 11 ways as a sum of consecutive naturals, for example, 24287 + ... + 24936.

It is an arithmetic number, because the mean of its divisors is an integer number (1780268).

Almost surely, 2^15997475 is an apocalyptic number.

15997475 is a deficient number, since it is larger than the sum of its proper divisors (5365741).

15997475 is a wasteful number, since it uses less digits than its factorization.

15997475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49246 (or 49241 counting only the distinct ones).

The product of its digits is 396900, while the sum is 47.

The square root of 15997475 is about 3999.6843625466. The cubic root of 15997475 is about 251.9709538622.

The spelling of 15997475 in words is "fifteen million, nine hundred ninety-seven thousand, four hundred seventy-five".