7931990 has 16 divisors (see below), whose sum is σ = 15575760. Its totient is φ = 2884320.

The previous prime is 7931977. The next prime is 7932011. The reversal of 7931990 is 991397.

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, 35945 + ... + 36164.

It is an arithmetic number, because the mean of its divisors is an integer number (973485).

Almost surely, 2^7931990 is an apocalyptic number.

7931990 is a deficient number, since it is larger than the sum of its proper divisors (7643770).

7931990 is a wasteful number, since it uses less digits than its factorization.

7931990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72127.

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 7931990 is about 2816.3788807616. The cubic root of 7931990 is about 199.4316363438.

The spelling of 7931990 in words is "seven million, nine hundred thirty-one thousand, nine hundred ninety".