393922431 has 24 divisors (see below), whose sum is σ = 651880320. Its totient is φ = 224546256.

The previous prime is 393922423. The next prime is 393922433. The reversal of 393922431 is 134229393.

It is not a de Polignac number, because 393922431 - 2³ = 393922423 is a prime.

It is a super-2 number, since 2×393922431² = 310349763289899522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393922433) 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, 18936 + ... + 33858.

It is an arithmetic number, because the mean of its divisors is an integer number (27161680).

Almost surely, 2^393922431 is an apocalyptic number.

393922431 is a deficient number, since it is larger than the sum of its proper divisors (257957889).

393922431 is a wasteful number, since it uses less digits than its factorization.

393922431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15355 (or 15352 counting only the distinct ones).

The product of its digits is 34992, while the sum is 36.

The square root of 393922431 is about 19847.4792102171. The cubic root of 393922431 is about 733.0555797760.

The spelling of 393922431 in words is "three hundred ninety-three million, nine hundred twenty-two thousand, four hundred thirty-one".