396931977 has 24 divisors (see below), whose sum is σ = 621621000. Its totient is φ = 242615808.

The previous prime is 396931957. The next prime is 396931981. The reversal of 396931977 is 779139693.

It can be written as a sum of positive squares in 4 ways, for example, as 47279376 + 349652601 = 6876^2 + 18699^2 .

It is not a de Polignac number, because 396931977 - 2⁸ = 396931721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (396931937) 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, 6049 + ... + 28817.

It is an arithmetic number, because the mean of its divisors is an integer number (25900875).

Almost surely, 2^396931977 is an apocalyptic number.

It is an amenable number.

396931977 is a deficient number, since it is larger than the sum of its proper divisors (224689023).

396931977 is a wasteful number, since it uses less digits than its factorization.

396931977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22937 (or 22934 counting only the distinct ones).

The product of its digits is 1928934, while the sum is 54.

The square root of 396931977 is about 19923.1517837916. The cubic root of 396931977 is about 734.9176806321.

The spelling of 396931977 in words is "three hundred ninety-six million, nine hundred thirty-one thousand, nine hundred seventy-seven".