394071793218 has 24 divisors (see below), whose sum is σ = 853841191788. Its totient is φ = 131354345472.

The previous prime is 394071793211. The next prime is 394071793231. The reversal of 394071793218 is 812397170493.

394071793218 is a `hidden beast` number, since 3 + 9 + 407 + 17 + 9 + 3 + 218 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 354759610689 + 39312182529 = 595617^2 + 198273^2 .

It is not an unprimeable number, because it can be changed into a prime (394071793211) 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, 685030 + ... + 1121342.

Almost surely, 2^394071793218 is an apocalyptic number.

394071793218 is an abundant number, since it is smaller than the sum of its proper divisors (459769398570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

394071793218 is a wasteful number, since it uses less digits than its factorization.

394071793218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486498 (or 486495 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 54.

The spelling of 394071793218 in words is "three hundred ninety-four billion, seventy-one million, seven hundred ninety-three thousand, two hundred eighteen".