390508820 has 24 divisors (see below), whose sum is σ = 883151304. Its totient is φ = 144187776.

The previous prime is 390508817. The next prime is 390508837. The reversal of 390508820 is 28805093.

It can be written as a sum of positive squares in 4 ways, for example, as 24245776 + 366263044 = 4924^2 + 19138^2 .

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 in 7 ways as a sum of consecutive naturals, for example, 750719 + ... + 751238.

It is an arithmetic number, because the mean of its divisors is an integer number (36797971).

Almost surely, 2^390508820 is an apocalyptic number.

It is an amenable number.

390508820 is an abundant number, since it is smaller than the sum of its proper divisors (492642484).

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

390508820 is a wasteful number, since it uses less digits than its factorization.

390508820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1501979 (or 1501977 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 390508820 is about 19761.2960101305. The cubic root of 390508820 is about 730.9319553926.

The spelling of 390508820 in words is "three hundred ninety million, five hundred eight thousand, eight hundred twenty".