391937916 has 12 divisors (see below), whose sum is σ = 914521832. Its totient is φ = 130645968.

The previous prime is 391937911. The next prime is 391937927. The reversal of 391937916 is 619739193.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391937911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16330735 + ... + 16330758.

Almost surely, 2^391937916 is an apocalyptic number.

It is an amenable number.

391937916 is an abundant number, since it is smaller than the sum of its proper divisors (522583916).

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

391937916 is a wasteful number, since it uses less digits than its factorization.

391937916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32661500 (or 32661498 counting only the distinct ones).

The product of its digits is 275562, while the sum is 48.

The square root of 391937916 is about 19797.4219533756. The cubic root of 391937916 is about 731.8225031729.

The spelling of 391937916 in words is "three hundred ninety-one million, nine hundred thirty-seven thousand, nine hundred sixteen".