397881 has 12 divisors (see below), whose sum is σ = 627120. Its totient is φ = 241080.

The previous prime is 397867. The next prime is 397897. The reversal of 397881 is 188793.

397881 = T₁₅₈ + T₁₅₉ + ... + T₁₈₄.

It is not a de Polignac number, because 397881 - 2⁵ = 397849 is a prime.

It is a super-2 number, since 2×397881² = 316618580322, which contains 22 as substring.

It is a Curzon number.

397881 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 397881.

It is not an unprimeable number, because it can be changed into a prime (397811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1911 + ... + 2108.

It is an arithmetic number, because the mean of its divisors is an integer number (52260).

2³⁹⁷⁸⁸¹ is an apocalyptic number.

It is an amenable number.

397881 is a deficient number, since it is larger than the sum of its proper divisors (229239).

397881 is a wasteful number, since it uses less digits than its factorization.

397881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4036 (or 4033 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 397881 is about 630.7780909321. The cubic root of 397881 is about 73.5502918333.

The spelling of 397881 in words is "three hundred ninety-seven thousand, eight hundred eighty-one".