390289664 has 18 divisors (see below), whose sum is σ = 779055270. Its totient is φ = 195144704.

The previous prime is 390289649. The next prime is 390289681. The reversal of 390289664 is 466982093.

It can be written as a sum of positive squares in only one way, i.e., 360696064 + 29593600 = 18992^2 + 5440^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 762029 + ... + 762540.

Almost surely, 2^390289664 is an apocalyptic number.

It is an amenable number.

390289664 is a deficient number, since it is larger than the sum of its proper divisors (388765606).

390289664 is an equidigital number, since it uses as much as digits as its factorization.

390289664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524585 (or 1524571 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 47.

The square root of 390289664 is about 19755.7501502727. The cubic root of 390289664 is about 730.7951952726.

The spelling of 390289664 in words is "three hundred ninety million, two hundred eighty-nine thousand, six hundred sixty-four".