393668431 has 6 divisors (see below), whose sum is σ = 426280200. Its totient is φ = 363386088.

The previous prime is 393668399. The next prime is 393668447. The reversal of 393668431 is 134866393.

It is not a de Polignac number, because 393668431 - 2⁵ = 393668399 is a prime.

It is a super-2 number, since 2×393668431² = 309949667132003522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393668461) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1164531 + ... + 1164868.

It is an arithmetic number, because the mean of its divisors is an integer number (71046700).

Almost surely, 2^393668431 is an apocalyptic number.

393668431 is a deficient number, since it is larger than the sum of its proper divisors (32611769).

393668431 is a wasteful number, since it uses less digits than its factorization.

393668431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2329425 (or 2329412 counting only the distinct ones).

The product of its digits is 279936, while the sum is 43.

The square root of 393668431 is about 19841.0793809208. The cubic root of 393668431 is about 732.8979885546.

The spelling of 393668431 in words is "three hundred ninety-three million, six hundred sixty-eight thousand, four hundred thirty-one".