397450931 has 2 divisors, whose sum is σ = 397450932. Its totient is φ = 397450930.

The previous prime is 397450919. The next prime is 397451009. The reversal of 397450931 is 139054793.

It is a weak prime.

It is an emirp because it is prime and its reverse (139054793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397450931 - 2²² = 393256627 is a prime.

It is a super-2 number, since 2×397450931² = 315934485105533522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (397450331) 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, 198725465 + 198725466.

It is an arithmetic number, because the mean of its divisors is an integer number (198725466).

Almost surely, 2^397450931 is an apocalyptic number.

397450931 is a deficient number, since it is larger than the sum of its proper divisors (1).

397450931 is an equidigital number, since it uses as much as digits as its factorization.

397450931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102060, while the sum is 41.

The square root of 397450931 is about 19936.1714228184. The cubic root of 397450931 is about 735.2378214472.

The spelling of 397450931 in words is "three hundred ninety-seven million, four hundred fifty thousand, nine hundred thirty-one".