390404636 has 24 divisors (see below), whose sum is σ = 695590896. Its totient is φ = 191675520.

The previous prime is 390404633. The next prime is 390404659. The reversal of 390404636 is 636404093.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 390404596 and 390404605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390404633) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 208175 + ... + 210041.

It is an arithmetic number, because the mean of its divisors is an integer number (28982954).

Almost surely, 2^390404636 is an apocalyptic number.

It is an amenable number.

390404636 is a deficient number, since it is larger than the sum of its proper divisors (305186260).

390404636 is a wasteful number, since it uses less digits than its factorization.

390404636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2789 (or 2787 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 35.

The square root of 390404636 is about 19758.6597723631. The cubic root of 390404636 is about 730.8669477375.

The spelling of 390404636 in words is "three hundred ninety million, four hundred four thousand, six hundred thirty-six".