390635644 has 18 divisors (see below), whose sum is σ = 795222960. Its totient is φ = 167415192.

The previous prime is 390635633. The next prime is 390635669. The reversal of 390635644 is 446536093.

It is a junction number, because it is equal to n+sod(n) for n = 390635597 and 390635606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 996324 + ... + 996715.

Almost surely, 2^390635644 is an apocalyptic number.

It is an amenable number.

390635644 is an abundant number, since it is smaller than the sum of its proper divisors (404587316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

390635644 is a wasteful number, since it uses less digits than its factorization.

390635644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1993057 (or 1993048 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 40.

The square root of 390635644 is about 19764.5046484854. The cubic root of 390635644 is about 731.0110741185.

The spelling of 390635644 in words is "three hundred ninety million, six hundred thirty-five thousand, six hundred forty-four".