397313281 has 16 divisors (see below), whose sum is σ = 412776000. Its totient is φ = 382224960.

The previous prime is 397313263. The next prime is 397313303. The reversal of 397313281 is 182313793.

It is not a de Polignac number, because 397313281 - 2⁷ = 397313153 is a prime.

It is a super-2 number, since 2×397313281² = 315715686517969922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 397313281.

It is not an unprimeable number, because it can be changed into a prime (397323281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 795970 + ... + 796468.

It is an arithmetic number, because the mean of its divisors is an integer number (25798500).

Almost surely, 2^397313281 is an apocalyptic number.

It is an amenable number.

397313281 is a deficient number, since it is larger than the sum of its proper divisors (15462719).

397313281 is a wasteful number, since it uses less digits than its factorization.

397313281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816.

The product of its digits is 27216, while the sum is 37.

The square root of 397313281 is about 19932.7188561922. The cubic root of 397313281 is about 735.1529328366.

The spelling of 397313281 in words is "three hundred ninety-seven million, three hundred thirteen thousand, two hundred eighty-one".