7961990 has 16 divisors (see below), whose sum is σ = 14407200. Its totient is φ = 3168000.

The previous prime is 7961981. The next prime is 7961999. The reversal of 7961990 is 991697.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (7961981) and next prime (7961999).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7961999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11 + ... + 3990.

It is an arithmetic number, because the mean of its divisors is an integer number (900450).

Almost surely, 2^7961990 is an apocalyptic number.

7961990 is a deficient number, since it is larger than the sum of its proper divisors (6445210).

7961990 is a wasteful number, since it uses less digits than its factorization.

7961990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4207.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 7961990 is about 2821.6998422936. The cubic root of 7961990 is about 199.6827470188.

The spelling of 7961990 in words is "seven million, nine hundred sixty-one thousand, nine hundred ninety".