396931557 has 16 divisors (see below), whose sum is σ = 580295232. Its totient is φ = 239339520.

The previous prime is 396931553. The next prime is 396931573. The reversal of 396931557 is 755139693.

It is not a de Polignac number, because 396931557 - 2² = 396931553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396931553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24028 + ... + 37029.

It is an arithmetic number, because the mean of its divisors is an integer number (36268452).

Almost surely, 2^396931557 is an apocalyptic number.

It is an amenable number.

396931557 is a deficient number, since it is larger than the sum of its proper divisors (183363675).

396931557 is a wasteful number, since it uses less digits than its factorization.

396931557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61268.

The product of its digits is 765450, while the sum is 48.

The square root of 396931557 is about 19923.1412432879. The cubic root of 396931557 is about 734.9174214227.

The spelling of 396931557 in words is "three hundred ninety-six million, nine hundred thirty-one thousand, five hundred fifty-seven".