390928 has 20 divisors (see below), whose sum is σ = 773388. Its totient is φ = 191360.

The previous prime is 390893. The next prime is 390953. The reversal of 390928 is 829093.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 204304 + 186624 = 452^2 + 432^2 .

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 390928.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 618 + ... + 1078.

2³⁹⁰⁹²⁸ is an apocalyptic number.

It is an amenable number.

390928 is a deficient number, since it is larger than the sum of its proper divisors (382460).

390928 is a wasteful number, since it uses less digits than its factorization.

390928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522 (or 516 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 390928 is about 625.2423530120. The cubic root of 390928 is about 73.1193394211.

The spelling of 390928 in words is "three hundred ninety thousand, nine hundred twenty-eight".