394570878813 has 12 divisors (see below), whose sum is σ = 569951997628. Its totient is φ = 263039736960.

The previous prime is 394570878719. The next prime is 394570878833. The reversal of 394570878813 is 318878075493.

394570878813 is a `hidden beast` number, since 39 + 457 + 0 + 8 + 78 + 81 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 231579425529 + 162991453284 = 481227^2 + 403722^2 .

It is not a de Polignac number, because 394570878813 - 2²² = 394566684509 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 (394570878833) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 283948 + ... + 932613.

Almost surely, 2^394570878813 is an apocalyptic number.

It is an amenable number.

394570878813 is a deficient number, since it is larger than the sum of its proper divisors (175381118815).

394570878813 is a wasteful number, since it uses less digits than its factorization.

394570878813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252604 (or 1252601 counting only the distinct ones).

The product of its (nonzero) digits is 40642560, while the sum is 63.

The spelling of 394570878813 in words is "three hundred ninety-four billion, five hundred seventy million, eight hundred seventy-eight thousand, eight hundred thirteen".