396931971 has 4 divisors (see below), whose sum is σ = 529242632. Its totient is φ = 264621312.

The previous prime is 396931957. The next prime is 396931981. The reversal of 396931971 is 179139693.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 396931971 - 2⁵ = 396931939 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 396931971.

It is not an unprimeable number, because it can be changed into a prime (396931921) 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, 66155326 + ... + 66155331.

It is an arithmetic number, because the mean of its divisors is an integer number (132310658).

Almost surely, 2^396931971 is an apocalyptic number.

396931971 is a deficient number, since it is larger than the sum of its proper divisors (132310661).

396931971 is a wasteful number, since it uses less digits than its factorization.

396931971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132310660.

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

The square root of 396931971 is about 19923.1516332131. The cubic root of 396931971 is about 734.9176769291.

The spelling of 396931971 in words is "three hundred ninety-six million, nine hundred thirty-one thousand, nine hundred seventy-one".