391243852 has 12 divisors (see below), whose sum is σ = 691324816. Its totient is φ = 193722480.

The previous prime is 391243841. The next prime is 391243871. The reversal of 391243852 is 258342193.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 474399 + ... + 475222.

Almost surely, 2^391243852 is an apocalyptic number.

It is an amenable number.

391243852 is a deficient number, since it is larger than the sum of its proper divisors (300080964).

391243852 is a wasteful number, since it uses less digits than its factorization.

391243852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949728 (or 949726 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The square root of 391243852 is about 19779.8850350552. The cubic root of 391243852 is about 731.3902648410.

The spelling of 391243852 in words is "three hundred ninety-one million, two hundred forty-three thousand, eight hundred fifty-two".