397859131 has 2 divisors, whose sum is σ = 397859132. Its totient is φ = 397859130.

The previous prime is 397859081. The next prime is 397859197. The reversal of 397859131 is 131958793.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (131958793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397859131 - 2⁷ = 397859003 is a prime.

It is a super-2 number, since 2×397859131² = 316583776240150322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (397859431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198929565 + 198929566.

It is an arithmetic number, because the mean of its divisors is an integer number (198929566).

Almost surely, 2^397859131 is an apocalyptic number.

397859131 is a deficient number, since it is larger than the sum of its proper divisors (1).

397859131 is an equidigital number, since it uses as much as digits as its factorization.

397859131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 46.

The square root of 397859131 is about 19946.4064683341. The cubic root of 397859131 is about 735.4894427727.

The spelling of 397859131 in words is "three hundred ninety-seven million, eight hundred fifty-nine thousand, one hundred thirty-one".