391304920 has 16 divisors (see below), whose sum is σ = 880436160. Its totient is φ = 156521952.

The previous prime is 391304897. The next prime is 391304923. The reversal of 391304920 is 29403193.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391304923) 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, 4891272 + ... + 4891351.

It is an arithmetic number, because the mean of its divisors is an integer number (55027260).

Almost surely, 2^391304920 is an apocalyptic number.

It is an amenable number.

391304920 is an abundant number, since it is smaller than the sum of its proper divisors (489131240).

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

391304920 is a wasteful number, since it uses less digits than its factorization.

391304920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9782634 (or 9782630 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 391304920 is about 19781.4286642800. The cubic root of 391304920 is about 731.4283163161.

The spelling of 391304920 in words is "three hundred ninety-one million, three hundred four thousand, nine hundred twenty".