397307961 has 24 divisors (see below), whose sum is σ = 591187584. Its totient is φ = 256932000.

The previous prime is 397307959. The next prime is 397307971. The reversal of 397307961 is 169703793.

It is not a de Polignac number, because 397307961 - 2¹ = 397307959 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (397307941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120586 + ... + 123836.

It is an arithmetic number, because the mean of its divisors is an integer number (24632816).

Almost surely, 2^397307961 is an apocalyptic number.

It is an amenable number.

397307961 is a deficient number, since it is larger than the sum of its proper divisors (193879623).

397307961 is a wasteful number, since it uses less digits than its factorization.

397307961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3661 (or 3658 counting only the distinct ones).

The product of its (nonzero) digits is 214326, while the sum is 45.

The square root of 397307961 is about 19932.5854068156. The cubic root of 397307961 is about 735.1496516046.

The spelling of 397307961 in words is "three hundred ninety-seven million, three hundred seven thousand, nine hundred sixty-one".