391939120 has 40 divisors (see below), whose sum is σ = 912111264. Its totient is φ = 156628992.

The previous prime is 391939111. The next prime is 391939153. The reversal of 391939120 is 21939193.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 391939120.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134317 + ... + 137203.

Almost surely, 2^391939120 is an apocalyptic number.

It is an amenable number.

391939120 is an abundant number, since it is smaller than the sum of its proper divisors (520172144).

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

391939120 is a wasteful number, since it uses less digits than its factorization.

391939120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4597 (or 4591 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 391939120 is about 19797.4523613520. The cubic root of 391939120 is about 731.8232525377.

The spelling of 391939120 in words is "three hundred ninety-one million, nine hundred thirty-nine thousand, one hundred twenty".