393971295823 has 32 divisors (see below), whose sum is σ = 461275545600. Its totient is φ = 336344490720.

The previous prime is 393971295703. The next prime is 393971295833. The reversal of 393971295823 is 328592179393.

It is a de Polignac number, because none of the positive numbers 2^k-393971295823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393971295833) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 123616636 + ... + 123619822.

It is an arithmetic number, because the mean of its divisors is an integer number (14414860800).

Almost surely, 2^393971295823 is an apocalyptic number.

393971295823 is a deficient number, since it is larger than the sum of its proper divisors (67304249777).

393971295823 is an equidigital number, since it uses as much as digits as its factorization.

393971295823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4532 (or 4518 counting only the distinct ones).

The product of its digits is 22044960, while the sum is 61.

The spelling of 393971295823 in words is "three hundred ninety-three billion, nine hundred seventy-one million, two hundred ninety-five thousand, eight hundred twenty-three".