396631791 has 24 divisors (see below), whose sum is σ = 578345040. Its totient is φ = 261927936.

The previous prime is 396631789. The next prime is 396631799. The reversal of 396631791 is 197136693.

396631791 is a `hidden beast` number, since 3 + 9 + 6 + 631 + 7 + 9 + 1 = 666.

It is not a de Polignac number, because 396631791 - 2¹ = 396631789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396631799) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 675400 + ... + 675986.

It is an arithmetic number, because the mean of its divisors is an integer number (24097710).

Almost surely, 2^396631791 is an apocalyptic number.

396631791 is a deficient number, since it is larger than the sum of its proper divisors (181713249).

396631791 is a wasteful number, since it uses less digits than its factorization.

396631791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175 (or 1172 counting only the distinct ones).

The product of its digits is 183708, while the sum is 45.

The square root of 396631791 is about 19915.6167617275. The cubic root of 396631791 is about 734.7323695891.

The spelling of 396631791 in words is "three hundred ninety-six million, six hundred thirty-one thousand, seven hundred ninety-one".