15990885 has 32 divisors (see below), whose sum is σ = 29352960. Its totient is φ = 8251200.

The previous prime is 15990881. The next prime is 15990899. The reversal of 15990885 is 58809951.

It is not a de Polignac number, because 15990885 - 2² = 15990881 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 15990885.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15990881) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2275 + ... + 6095.

It is an arithmetic number, because the mean of its divisors is an integer number (917280).

Almost surely, 2^15990885 is an apocalyptic number.

15990885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15990885 is a deficient number, since it is larger than the sum of its proper divisors (13362075).

15990885 is a wasteful number, since it uses less digits than its factorization.

15990885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3866 (or 3860 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 45.

The square root of 15990885 is about 3998.8604626818. The cubic root of 15990885 is about 251.9363501379.

The spelling of 15990885 in words is "fifteen million, nine hundred ninety thousand, eight hundred eighty-five".