397970431 has 2 divisors, whose sum is σ = 397970432. Its totient is φ = 397970430.

The previous prime is 397970413. The next prime is 397970453. The reversal of 397970431 is 134079793.

Together with previous prime (397970413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 397970431 - 2⁹ = 397969919 is a prime.

It is a super-4 number, since 4×397970431⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397970471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198985215 + 198985216.

It is an arithmetic number, because the mean of its divisors is an integer number (198985216).

Almost surely, 2^397970431 is an apocalyptic number.

397970431 is a deficient number, since it is larger than the sum of its proper divisors (1).

397970431 is an equidigital number, since it uses as much as digits as its factorization.

397970431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142884, while the sum is 43.

The square root of 397970431 is about 19949.1962494733. The cubic root of 397970431 is about 735.5580200961.

The spelling of 397970431 in words is "three hundred ninety-seven million, nine hundred seventy thousand, four hundred thirty-one".