390931428 has 12 divisors (see below), whose sum is σ = 912173360. Its totient is φ = 130310472.

The previous prime is 390931427. The next prime is 390931451. The reversal of 390931428 is 824139093.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (390931423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16288798 + ... + 16288821.

Almost surely, 2^390931428 is an apocalyptic number.

It is an amenable number.

390931428 is an abundant number, since it is smaller than the sum of its proper divisors (521241932).

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

390931428 is a wasteful number, since it uses less digits than its factorization.

390931428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32577626 (or 32577624 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 390931428 is about 19771.9859397077. The cubic root of 390931428 is about 731.1955314532.

The spelling of 390931428 in words is "three hundred ninety million, nine hundred thirty-one thousand, four hundred twenty-eight".