390647956 has 24 divisors (see below), whose sum is σ = 689290056. Its totient is φ = 193714560.

The previous prime is 390647953. The next prime is 390647993. The reversal of 390647956 is 659746093.

It can be written as a sum of positive squares in 4 ways, for example, as 59043856 + 331604100 = 7684^2 + 18210^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390647953) 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, 489750 + ... + 490546.

It is an arithmetic number, because the mean of its divisors is an integer number (28720419).

Almost surely, 2^390647956 is an apocalyptic number.

It is an amenable number.

390647956 is a deficient number, since it is larger than the sum of its proper divisors (298642100).

390647956 is a wasteful number, since it uses less digits than its factorization.

390647956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1659 (or 1657 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 49.

The square root of 390647956 is about 19764.8161134881. The cubic root of 390647956 is about 731.0187540063.

The spelling of 390647956 in words is "three hundred ninety million, six hundred forty-seven thousand, nine hundred fifty-six".