390666685 has 8 divisors (see below), whose sum is σ = 484965720. Its totient is φ = 301756224.

The previous prime is 390666677. The next prime is 390666701. The reversal of 390666685 is 586666093.

It can be written as a sum of positive squares in 4 ways, for example, as 5447556 + 385219129 = 2334^2 + 19627^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 390666685 - 2³ = 390666677 is a prime.

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, 1346982 + ... + 1347271.

It is an arithmetic number, because the mean of its divisors is an integer number (60620715).

Almost surely, 2^390666685 is an apocalyptic number.

It is an amenable number.

390666685 is a deficient number, since it is larger than the sum of its proper divisors (94299035).

390666685 is a wasteful number, since it uses less digits than its factorization.

390666685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2694287.

The product of its (nonzero) digits is 1399680, while the sum is 49.

The square root of 390666685 is about 19765.2899042741. The cubic root of 390666685 is about 731.0304363333.

The spelling of 390666685 in words is "three hundred ninety million, six hundred sixty-six thousand, six hundred eighty-five".