397881131 has 4 divisors (see below), whose sum is σ = 411601200. Its totient is φ = 384161064.

The previous prime is 397881083. The next prime is 397881137. The reversal of 397881131 is 131188793.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 397881131 - 2⁶ = 397881067 is a prime.

It is a super-2 number, since 2×397881131² = 316618788811678322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397881137) 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 in 3 ways as a sum of consecutive naturals, for example, 6859991 + ... + 6860048.

It is an arithmetic number, because the mean of its divisors is an integer number (102900300).

Almost surely, 2^397881131 is an apocalyptic number.

397881131 is a deficient number, since it is larger than the sum of its proper divisors (13720069).

397881131 is a wasteful number, since it uses less digits than its factorization.

397881131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13720068.

The product of its digits is 36288, while the sum is 41.

The square root of 397881131 is about 19946.9579384928. The cubic root of 397881131 is about 735.5029990529.

The spelling of 397881131 in words is "three hundred ninety-seven million, eight hundred eighty-one thousand, one hundred thirty-one".