397866231 has 18 divisors (see below), whose sum is σ = 668524272. Its totient is φ = 227351880.

The previous prime is 397866149. The next prime is 397866247. The reversal of 397866231 is 132668793.

It is not a de Polignac number, because 397866231 - 2¹³ = 397858039 is a prime.

It is a super-2 number, since 2×397866231² = 316595075540290722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397866281) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 450655 + ... + 451536.

Almost surely, 2^397866231 is an apocalyptic number.

397866231 is a deficient number, since it is larger than the sum of its proper divisors (270658041).

397866231 is a wasteful number, since it uses less digits than its factorization.

397866231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902211 (or 902201 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 397866231 is about 19946.5844444607. The cubic root of 397866231 is about 735.4938178087.

The spelling of 397866231 in words is "three hundred ninety-seven million, eight hundred sixty-six thousand, two hundred thirty-one".