390615668 has 6 divisors (see below), whose sum is σ = 683577426. Its totient is φ = 195307832.

The previous prime is 390615653. The next prime is 390615691. The reversal of 390615668 is 866516093.

It can be written as a sum of positive squares in only one way, i.e., 256704484 + 133911184 = 16022^2 + 11572^2 .

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 as a sum of consecutive naturals, namely, 48826955 + ... + 48826962.

It is an arithmetic number, because the mean of its divisors is an integer number (113929571).

Almost surely, 2^390615668 is an apocalyptic number.

It is an amenable number.

390615668 is a deficient number, since it is larger than the sum of its proper divisors (292961758).

390615668 is a wasteful number, since it uses less digits than its factorization.

390615668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97653921 (or 97653919 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 390615668 is about 19763.9992916414. Note that the first 3 decimals coincide. The cubic root of 390615668 is about 730.9986132944.

The spelling of 390615668 in words is "three hundred ninety million, six hundred fifteen thousand, six hundred sixty-eight".