15990825 has 24 divisors (see below), whose sum is σ = 26712576. Its totient is φ = 8440000.

The previous prime is 15990811. The next prime is 15990827. The reversal of 15990825 is 52809951.

It is not a de Polignac number, because 15990825 - 2⁴ = 15990809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15990827) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6520 + ... + 8630.

It is an arithmetic number, because the mean of its divisors is an integer number (1113024).

Almost surely, 2^15990825 is an apocalyptic number.

15990825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15990825 is a deficient number, since it is larger than the sum of its proper divisors (10721751).

15990825 is a wasteful number, since it uses less digits than its factorization.

15990825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2225 (or 2220 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 39.

The square root of 15990825 is about 3998.8529605376. The cubic root of 15990825 is about 251.9360350376.

Subtracting from 15990825 its product of nonzero digits (32400), we obtain a triangular number (15958425 = T₅₆₄₉).

The spelling of 15990825 in words is "fifteen million, nine hundred ninety thousand, eight hundred twenty-five".