391039620 has 48 divisors (see below), whose sum is σ = 1095823680. Its totient is φ = 104190336.

The previous prime is 391039619. The next prime is 391039631. The reversal of 391039620 is 26930193.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105519 + ... + 109161.

It is an arithmetic number, because the mean of its divisors is an integer number (22829660).

Almost surely, 2^391039620 is an apocalyptic number.

391039620 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

391039620 is an abundant number, since it is smaller than the sum of its proper divisors (704784060).

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

391039620 is a wasteful number, since it uses less digits than its factorization.

391039620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5444 (or 5442 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 391039620 is about 19774.7217426694. The cubic root of 391039620 is about 731.2629790961.

The spelling of 391039620 in words is "three hundred ninety-one million, thirty-nine thousand, six hundred twenty".