394881935545 has 16 divisors (see below), whose sum is σ = 475094319120. Its totient is φ = 315081805824.

The previous prime is 394881935531. The next prime is 394881935551. The reversal of 394881935545 is 545539188493.

It can be written as a sum of positive squares in 8 ways, for example, as 6094768761 + 388787166784 = 78069^2 + 623528^2 .

It is a cyclic number.

It is not a de Polignac number, because 394881935545 - 2²³ = 394873546937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17070327 + ... + 17093443.

It is an arithmetic number, because the mean of its divisors is an integer number (29693394945).

Almost surely, 2^394881935545 is an apocalyptic number.

It is an amenable number.

394881935545 is a deficient number, since it is larger than the sum of its proper divisors (80212383575).

394881935545 is a wasteful number, since it uses less digits than its factorization.

394881935545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31884.

The product of its digits is 93312000, while the sum is 64.

The spelling of 394881935545 in words is "three hundred ninety-four billion, eight hundred eighty-one million, nine hundred thirty-five thousand, five hundred forty-five".