390521028 has 24 divisors (see below), whose sum is σ = 915201280. Its totient is φ = 129604320.

The previous prime is 390521011. The next prime is 390521029. The reversal of 390521028 is 820125093.

It is a happy number.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 390520986 and 390521004.

It is not an unprimeable number, because it can be changed into a prime (390521029) by changing a digit.

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, 68308 + ... + 73803.

Almost surely, 2^390521028 is an apocalyptic number.

It is an amenable number.

390521028 is an abundant number, since it is smaller than the sum of its proper divisors (524680252).

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

390521028 is a wasteful number, since it uses less digits than its factorization.

390521028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142347 (or 142345 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 390521028 is about 19761.6048943399. The cubic root of 390521028 is about 730.9395720573.

The spelling of 390521028 in words is "three hundred ninety million, five hundred twenty-one thousand, twenty-eight".