391397696 has 28 divisors (see below), whose sum is σ = 794747712. Its totient is φ = 191146368.

The previous prime is 391397689. The next prime is 391397711. The reversal of 391397696 is 696793193.

It is a happy number.

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, 68360 + ... + 73863.

Almost surely, 2^391397696 is an apocalyptic number.

It is an amenable number.

391397696 is an abundant number, since it is smaller than the sum of its proper divisors (403350016).

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

391397696 is a wasteful number, since it uses less digits than its factorization.

391397696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142278 (or 142268 counting only the distinct ones).

The product of its digits is 1653372, while the sum is 53.

The square root of 391397696 is about 19783.7735530914. The cubic root of 391397696 is about 731.4861174729.

The spelling of 391397696 in words is "three hundred ninety-one million, three hundred ninety-seven thousand, six hundred ninety-six".