390739728 has 20 divisors (see below), whose sum is σ = 1009411088. Its totient is φ = 130246560.

The previous prime is 390739673. The next prime is 390739751. The reversal of 390739728 is 827937093.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 8140411 = 390739728 / (3 + 9 + 0 + 7 + 3 + 9 + 7 + 2 + 8).

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 3 ways as a sum of consecutive naturals, for example, 4070158 + ... + 4070253.

Almost surely, 2^390739728 is an apocalyptic number.

It is an amenable number.

390739728 is an abundant number, since it is smaller than the sum of its proper divisors (618671360).

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

390739728 is a wasteful number, since it uses less digits than its factorization.

390739728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8140422 (or 8140416 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 48.

The square root of 390739728 is about 19767.1375773024. The cubic root of 390739728 is about 731.0759937788.

The spelling of 390739728 in words is "three hundred ninety million, seven hundred thirty-nine thousand, seven hundred twenty-eight".