394564361857 has 16 divisors (see below), whose sum is σ = 398156641344. Its totient is φ = 390990600000.

The previous prime is 394564361839. The next prime is 394564361951. The reversal of 394564361857 is 758163465493.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394564361857 is a prime.

It is a Duffinian number.

Its product of digits (65318400) is a multiple of the sum of its prime divisors (6480).

It is a junction number, because it is equal to n+sod(n) for n = 394564361795 and 394564361804.

It is not an unprimeable number, because it can be changed into a prime (394564361557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84831982 + ... + 84836632.

It is an arithmetic number, because the mean of its divisors is an integer number (24884790084).

Almost surely, 2^394564361857 is an apocalyptic number.

It is an amenable number.

394564361857 is a deficient number, since it is larger than the sum of its proper divisors (3592279487).

394564361857 is a wasteful number, since it uses less digits than its factorization.

394564361857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6480.

The product of its digits is 65318400, while the sum is 61.

The spelling of 394564361857 in words is "three hundred ninety-four billion, five hundred sixty-four million, three hundred sixty-one thousand, eight hundred fifty-seven".