397571931 has 12 divisors (see below), whose sum is σ = 592795840. Its totient is φ = 256497840.

The previous prime is 397571927. The next prime is 397571969. The reversal of 397571931 is 139175793.

It is not a de Polignac number, because 397571931 - 2² = 397571927 is a prime.

It is a super-2 number, since 2×397571931² = 316126880638137522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397570931) 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 11 ways as a sum of consecutive naturals, for example, 712216 + ... + 712773.

Almost surely, 2^397571931 is an apocalyptic number.

397571931 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

397571931 is a deficient number, since it is larger than the sum of its proper divisors (195223909).

397571931 is a wasteful number, since it uses less digits than its factorization.

397571931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1425026 (or 1425023 counting only the distinct ones).

The product of its digits is 178605, while the sum is 45.

The square root of 397571931 is about 19939.2058768648. The cubic root of 397571931 is about 735.3124258347.

The spelling of 397571931 in words is "three hundred ninety-seven million, five hundred seventy-one thousand, nine hundred thirty-one".