15899904 has 108 divisors (see below), whose sum is σ = 46979296. Its totient is φ = 5170176.

The previous prime is 15899881. The next prime is 15899909. The reversal of 15899904 is 40999851.

It is a self number, because there is not a number n which added to its sum of digits gives 15899904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15899909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154317 + ... + 154419.

Almost surely, 2^15899904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15899904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23489648).

15899904 is an abundant number, since it is smaller than the sum of its proper divisors (31079392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15899904 is a wasteful number, since it uses less digits than its factorization.

15899904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 15899904 is about 3987.4683697805. The cubic root of 15899904 is about 251.4576392997.

The spelling of 15899904 in words is "fifteen million, eight hundred ninety-nine thousand, nine hundred four".