15956990 has 64 divisors (see below), whose sum is σ = 34604928. Its totient is φ = 5184000.

The previous prime is 15956981. The next prime is 15957013. The reversal of 15956990 is 9965951.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 157940 + ... + 158040.

It is an arithmetic number, because the mean of its divisors is an integer number (540702).

Almost surely, 2^15956990 is an apocalyptic number.

15956990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15956990 is an abundant number, since it is smaller than the sum of its proper divisors (18647938).

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

15956990 is a wasteful number, since it uses less digits than its factorization.

15956990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213.

The product of its (nonzero) digits is 109350, while the sum is 44.

The square root of 15956990 is about 3994.6201321277. The cubic root of 15956990 is about 251.7582190090.

The spelling of 15956990 in words is "fifteen million, nine hundred fifty-six thousand, nine hundred ninety".