391386252 has 18 divisors (see below), whose sum is σ = 913394524. Its totient is φ = 130439240.

The previous prime is 391386241. The next prime is 391386271. The reversal of 391386252 is 252683193.

It is a self number, because there is not a number n which added to its sum of digits gives 391386252.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 65677 + ... + 71387.

Almost surely, 2^391386252 is an apocalyptic number.

It is an amenable number.

391386252 is an abundant number, since it is smaller than the sum of its proper divisors (522008272).

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

391386252 is an frugal number, since it uses more digits than its factorization.

391386252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11429 (or 5716 counting only the distinct ones).

The product of its digits is 77760, while the sum is 39.

The square root of 391386252 is about 19783.4843240517. The cubic root of 391386252 is about 731.4789881440.

The spelling of 391386252 in words is "three hundred ninety-one million, three hundred eighty-six thousand, two hundred fifty-two".