390649684 has 12 divisors (see below), whose sum is σ = 688165408. Its totient is φ = 194031000.

The previous prime is 390649669. The next prime is 390649717. The reversal of 390649684 is 486946093.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322782 + ... + 323989.

Almost surely, 2^390649684 is an apocalyptic number.

It is an amenable number.

390649684 is a deficient number, since it is larger than the sum of its proper divisors (297515724).

390649684 is a wasteful number, since it uses less digits than its factorization.

390649684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646926 (or 646924 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 49.

The square root of 390649684 is about 19764.8598274817. The cubic root of 390649684 is about 731.0198318724.

The spelling of 390649684 in words is "three hundred ninety million, six hundred forty-nine thousand, six hundred eighty-four".