394375521793 has 24 divisors (see below), whose sum is σ = 442554840000. Its totient is φ = 351050837280.

The previous prime is 394375521781. The next prime is 394375521811. The reversal of 394375521793 is 397125573493.

It is a de Polignac number, because none of the positive numbers 2^k-394375521793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394375521773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3138468 + ... + 3261706.

It is an arithmetic number, because the mean of its divisors is an integer number (18439785000).

Almost surely, 2^394375521793 is an apocalyptic number.

It is an amenable number.

394375521793 is a deficient number, since it is larger than the sum of its proper divisors (48179318207).

394375521793 is a wasteful number, since it uses less digits than its factorization.

394375521793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123813 (or 123802 counting only the distinct ones).

The product of its digits is 21432600, while the sum is 58.

The spelling of 394375521793 in words is "three hundred ninety-four billion, three hundred seventy-five million, five hundred twenty-one thousand, seven hundred ninety-three".