396931957 has 2 divisors, whose sum is σ = 396931958. Its totient is φ = 396931956.

The previous prime is 396931939. The next prime is 396931981. The reversal of 396931957 is 759139693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 393268561 + 3663396 = 19831^2 + 1914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-396931957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (396931937) 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, 198465978 + 198465979.

It is an arithmetic number, because the mean of its divisors is an integer number (198465979).

Almost surely, 2^396931957 is an apocalyptic number.

It is an amenable number.

396931957 is a deficient number, since it is larger than the sum of its proper divisors (1).

396931957 is an equidigital number, since it uses as much as digits as its factorization.

396931957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1377810, while the sum is 52.

The square root of 396931957 is about 19923.1512818630. The cubic root of 396931957 is about 734.9176682888.

The spelling of 396931957 in words is "three hundred ninety-six million, nine hundred thirty-one thousand, nine hundred fifty-seven".