15998825 has 12 divisors (see below), whose sum is σ = 19998720. Its totient is φ = 12695760.

The previous prime is 15998813. The next prime is 15998861. The reversal of 15998825 is 52889951.

It is not a de Polignac number, because 15998825 - 2⁴ = 15998809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15998825.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 656 + ... + 5694.

It is an arithmetic number, because the mean of its divisors is an integer number (1666560).

Almost surely, 2^15998825 is an apocalyptic number.

It is an amenable number.

15998825 is a deficient number, since it is larger than the sum of its proper divisors (3999895).

15998825 is a wasteful number, since it uses less digits than its factorization.

15998825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5176 (or 5171 counting only the distinct ones).

The product of its digits is 259200, while the sum is 47.

The square root of 15998825 is about 3999.8531223034. The cubic root of 15998825 is about 251.9780414645.

The spelling of 15998825 in words is "fifteen million, nine hundred ninety-eight thousand, eight hundred twenty-five".