391940156 has 12 divisors (see below), whose sum is σ = 702624720. Its totient is φ = 191190240.

The previous prime is 391940147. The next prime is 391940167. The reversal of 391940156 is 651049193.

It is a congruent number.

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, 1194776 + ... + 1195103.

It is an arithmetic number, because the mean of its divisors is an integer number (58552060).

Almost surely, 2^391940156 is an apocalyptic number.

It is an amenable number.

391940156 is a deficient number, since it is larger than the sum of its proper divisors (310684564).

391940156 is a wasteful number, since it uses less digits than its factorization.

391940156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2389924 (or 2389922 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 391940156 is about 19797.4785263174. The cubic root of 391940156 is about 731.8238973387.

The spelling of 391940156 in words is "three hundred ninety-one million, nine hundred forty thousand, one hundred fifty-six".