390649966 has 16 divisors (see below), whose sum is σ = 670150656. Its totient is φ = 167305176.

The previous prime is 390649957. The next prime is 390649993. The reversal of 390649966 is 669946093.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13035 + ... + 30841.

It is an arithmetic number, because the mean of its divisors is an integer number (41884416).

Almost surely, 2^390649966 is an apocalyptic number.

390649966 is a deficient number, since it is larger than the sum of its proper divisors (279500690).

390649966 is a wasteful number, since it uses less digits than its factorization.

390649966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19383.

The product of its (nonzero) digits is 1889568, while the sum is 52.

The square root of 390649966 is about 19764.8669613534. The cubic root of 390649966 is about 731.0200077738.

The spelling of 390649966 in words is "three hundred ninety million, six hundred forty-nine thousand, nine hundred sixty-six".