397838431 has 2 divisors, whose sum is σ = 397838432. Its totient is φ = 397838430.

The previous prime is 397838423. The next prime is 397838453. The reversal of 397838431 is 134838793.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (134838793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397838431 - 2³ = 397838423 is a prime.

It is a super-2 number, since 2×397838431² = 316550834361083522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397838411) 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, 198919215 + 198919216.

It is an arithmetic number, because the mean of its divisors is an integer number (198919216).

Almost surely, 2^397838431 is an apocalyptic number.

397838431 is a deficient number, since it is larger than the sum of its proper divisors (1).

397838431 is an equidigital number, since it uses as much as digits as its factorization.

397838431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 46.

The square root of 397838431 is about 19945.8875711260. The cubic root of 397838431 is about 735.4766870892.

The spelling of 397838431 in words is "three hundred ninety-seven million, eight hundred thirty-eight thousand, four hundred thirty-one".