397693491 has 16 divisors (see below), whose sum is σ = 571409664. Its totient is φ = 244579104.

The previous prime is 397693489. The next prime is 397693511. The reversal of 397693491 is 194396793.

It is not a de Polignac number, because 397693491 - 2¹ = 397693489 is a prime.

It is a super-2 number, since 2×397693491² = 316320225567534162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (397693411) 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, 103690 + ... + 107456.

It is an arithmetic number, because the mean of its divisors is an integer number (35713104).

Almost surely, 2^397693491 is an apocalyptic number.

397693491 is a deficient number, since it is larger than the sum of its proper divisors (173716173).

397693491 is a wasteful number, since it uses less digits than its factorization.

397693491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6490.

The product of its digits is 1102248, while the sum is 51.

The square root of 397693491 is about 19942.2539097265. The cubic root of 397693491 is about 735.3873602580.

The spelling of 397693491 in words is "three hundred ninety-seven million, six hundred ninety-three thousand, four hundred ninety-one".