397431431 has 2 divisors, whose sum is σ = 397431432. Its totient is φ = 397431430.

The previous prime is 397431323. The next prime is 397431449. The reversal of 397431431 is 134134793.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397431431 is a prime.

It is a super-2 number, since 2×397431431² = 315903484693415522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 397431391 and 397431400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397431451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198715715 + 198715716.

It is an arithmetic number, because the mean of its divisors is an integer number (198715716).

Almost surely, 2^397431431 is an apocalyptic number.

397431431 is a deficient number, since it is larger than the sum of its proper divisors (1).

397431431 is an equidigital number, since it uses as much as digits as its factorization.

397431431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 35.

The square root of 397431431 is about 19935.6823560168. The cubic root of 397431431 is about 735.2257970094.

The spelling of 397431431 in words is "three hundred ninety-seven million, four hundred thirty-one thousand, four hundred thirty-one".