390666618 has 32 divisors (see below), whose sum is σ = 869073600. Its totient is φ = 130083408.

The previous prime is 390666593. The next prime is 390666623. The reversal of 390666618 is 816666093.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55713 + ... + 62331.

It is an arithmetic number, because the mean of its divisors is an integer number (27158550).

Almost surely, 2^390666618 is an apocalyptic number.

390666618 is an abundant number, since it is smaller than the sum of its proper divisors (478406982).

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

390666618 is a wasteful number, since it uses less digits than its factorization.

390666618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7723 (or 7717 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 390666618 is about 19765.2882093836. The cubic root of 390666618 is about 731.0303945423.

The spelling of 390666618 in words is "three hundred ninety million, six hundred sixty-six thousand, six hundred eighteen".