397190881 has 4 divisors (see below), whose sum is σ = 397624000. Its totient is φ = 396757764.

The previous prime is 397190867. The next prime is 397190897. The reversal of 397190881 is 188091793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 397190881 - 2⁹ = 397190369 is a prime.

It is a super-2 number, since 2×397190881² = 315521191899112322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397190861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215181 + ... + 217018.

It is an arithmetic number, because the mean of its divisors is an integer number (99406000).

Almost surely, 2^397190881 is an apocalyptic number.

It is an amenable number.

397190881 is a deficient number, since it is larger than the sum of its proper divisors (433119).

397190881 is an equidigital number, since it uses as much as digits as its factorization.

397190881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433118.

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 397190881 is about 19929.6482909258. The cubic root of 397190881 is about 735.0774324148.

The spelling of 397190881 in words is "three hundred ninety-seven million, one hundred ninety thousand, eight hundred eighty-one".