396829931 has 2 divisors, whose sum is σ = 396829932. Its totient is φ = 396829930.

The previous prime is 396829919. The next prime is 396829957. The reversal of 396829931 is 139928693.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-396829931 is a prime.

It is a super-2 number, since 2×396829931² = 314947988274929522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 396829931.

It is not a weakly prime, because it can be changed into another prime (396829031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198414965 + 198414966.

It is an arithmetic number, because the mean of its divisors is an integer number (198414966).

Almost surely, 2^396829931 is an apocalyptic number.

396829931 is a deficient number, since it is larger than the sum of its proper divisors (1).

396829931 is an equidigital number, since it uses as much as digits as its factorization.

396829931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 50.

The square root of 396829931 is about 19920.5906287941. The cubic root of 396829931 is about 734.8546960053.

The spelling of 396829931 in words is "three hundred ninety-six million, eight hundred twenty-nine thousand, nine hundred thirty-one".