391317852 has 24 divisors (see below), whose sum is σ = 913441536. Its totient is φ = 130386928.

The previous prime is 391317841. The next prime is 391317853. The reversal of 391317852 is 258713193.

It is a super-2 number, since 2×391317852² = 306259322587787808, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 391317852.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391317853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35293 + ... + 45035.

It is an arithmetic number, because the mean of its divisors is an integer number (38060064).

Almost surely, 2^391317852 is an apocalyptic number.

It is an amenable number.

391317852 is an abundant number, since it is smaller than the sum of its proper divisors (522123684).

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

391317852 is a wasteful number, since it uses less digits than its factorization.

391317852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13097 (or 13095 counting only the distinct ones).

The product of its digits is 45360, while the sum is 39.

The square root of 391317852 is about 19781.7555338246. The cubic root of 391317852 is about 731.4363737382.

The spelling of 391317852 in words is "three hundred ninety-one million, three hundred seventeen thousand, eight hundred fifty-two".