394575959871 has 6 divisors (see below), whose sum is σ = 569943053160. Its totient is φ = 263050639908.

The previous prime is 394575959867. The next prime is 394575959879. The reversal of 394575959871 is 178959575493.

394575959871 is a `hidden beast` number, since 3 + 9 + 457 + 5 + 95 + 9 + 87 + 1 = 666.

It is not a de Polignac number, because 394575959871 - 2² = 394575959867 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 394575959871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394575959879) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21920886651 + ... + 21920886668.

It is an arithmetic number, because the mean of its divisors is an integer number (94990508860).

Almost surely, 2^394575959871 is an apocalyptic number.

394575959871 is a deficient number, since it is larger than the sum of its proper divisors (175367093289).

394575959871 is a wasteful number, since it uses less digits than its factorization.

394575959871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43841773325 (or 43841773322 counting only the distinct ones).

The product of its digits is 428652000, while the sum is 72.

The spelling of 394575959871 in words is "three hundred ninety-four billion, five hundred seventy-five million, nine hundred fifty-nine thousand, eight hundred seventy-one".