397802881 has 16 divisors (see below), whose sum is σ = 470192128. Its totient is φ = 329346000.

The previous prime is 397802863. The next prime is 397802887. The reversal of 397802881 is 188208793.

It is a cyclic number.

It is not a de Polignac number, because 397802881 - 2⁹ = 397802369 is a prime.

It is a super-2 number, since 2×397802881² = 316494264263800322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (397802887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138106 + ... + 140956.

It is an arithmetic number, because the mean of its divisors is an integer number (29387008).

Almost surely, 2^397802881 is an apocalyptic number.

397802881 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

397802881 is a deficient number, since it is larger than the sum of its proper divisors (72389247).

397802881 is a wasteful number, since it uses less digits than its factorization.

397802881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3532.

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 397802881 is about 19944.9963900724. The cubic root of 397802881 is about 735.4547795567.

It can be divided in two parts, 397 and 802881, that added together give a triangular number (803278 = T₁₂₆₇).

The spelling of 397802881 in words is "three hundred ninety-seven million, eight hundred two thousand, eight hundred eighty-one".