390668820 has 48 divisors (see below), whose sum is σ = 1129164288. Its totient is φ = 100817280.

The previous prime is 390668819. The next prime is 390668833. The reversal of 390668820 is 28866093.

390668820 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 in 15 ways as a sum of consecutive naturals, for example, 103159 + ... + 106878.

It is an arithmetic number, because the mean of its divisors is an integer number (23524256).

Almost surely, 2^390668820 is an apocalyptic number.

390668820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

390668820 is an abundant number, since it is smaller than the sum of its proper divisors (738495468).

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

390668820 is a wasteful number, since it uses less digits than its factorization.

390668820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210080 (or 210078 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 390668820 is about 19765.3439130211. The cubic root of 390668820 is about 731.0317680287.

The spelling of 390668820 in words is "three hundred ninety million, six hundred sixty-eight thousand, eight hundred twenty".