390647979 has 12 divisors (see below), whose sum is σ = 564442632. Its totient is φ = 260352000.

The previous prime is 390647953. The next prime is 390647993. The reversal of 390647979 is 979746093.

It is not a de Polignac number, because 390647979 - 2²⁸ = 122212523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (390647779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47019 + ... + 54699.

It is an arithmetic number, because the mean of its divisors is an integer number (47036886).

Almost surely, 2^390647979 is an apocalyptic number.

390647979 is a deficient number, since it is larger than the sum of its proper divisors (173794653).

390647979 is a wasteful number, since it uses less digits than its factorization.

390647979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13338 (or 13335 counting only the distinct ones).

The product of its (nonzero) digits is 2571912, while the sum is 54.

The square root of 390647979 is about 19764.8166953301. The cubic root of 390647979 is about 731.0187683529.

The spelling of 390647979 in words is "three hundred ninety million, six hundred forty-seven thousand, nine hundred seventy-nine".