7993990 has 16 divisors (see below), whose sum is σ = 14661648. Its totient is φ = 3137056.

The previous prime is 7993987. The next prime is 7994017. The reversal of 7993990 is 993997.

It is a super-2 number, since 2×7993990² = 127807752240200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7993990.

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, 7012 + ... + 8071.

It is an arithmetic number, because the mean of its divisors is an integer number (916353).

Almost surely, 2^7993990 is an apocalyptic number.

7993990 is a deficient number, since it is larger than the sum of its proper divisors (6667658).

7993990 is a wasteful number, since it uses less digits than its factorization.

7993990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15143.

The product of its (nonzero) digits is 137781, while the sum is 46.

The square root of 7993990 is about 2827.3644971952. The cubic root of 7993990 is about 199.9499041197.

The spelling of 7993990 in words is "seven million, nine hundred ninety-three thousand, nine hundred ninety".