15791990 has 16 divisors (see below), whose sum is σ = 28635552. Its totient is φ = 6270144.

The previous prime is 15791981. The next prime is 15792001. The reversal of 15791990 is 9919751.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4394 + ... + 7133.

It is an arithmetic number, because the mean of its divisors is an integer number (1789722).

Almost surely, 2^15791990 is an apocalyptic number.

15791990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15791990 is a deficient number, since it is larger than the sum of its proper divisors (12843562).

15791990 is a wasteful number, since it uses less digits than its factorization.

15791990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11671.

The product of its (nonzero) digits is 25515, while the sum is 41.

The square root of 15791990 is about 3973.9136880410. The cubic root of 15791990 is about 250.8874592698.

The spelling of 15791990 in words is "fifteen million, seven hundred ninety-one thousand, nine hundred ninety".