394336881 has 12 divisors (see below), whose sum is σ = 572582400. Its totient is φ = 261513720.

The previous prime is 394336871. The next prime is 394336883. The reversal of 394336881 is 188633493.

It is not a de Polignac number, because 394336881 - 2⁷ = 394336753 is a prime.

It is a super-2 number, since 2×394336881² = 311003151433616322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (394336883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112981 + ... + 116418.

It is an arithmetic number, because the mean of its divisors is an integer number (47715200).

Almost surely, 2^394336881 is an apocalyptic number.

It is an amenable number.

394336881 is a deficient number, since it is larger than the sum of its proper divisors (178245519).

394336881 is a wasteful number, since it uses less digits than its factorization.

394336881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229596 (or 229593 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 394336881 is about 19857.9173379285. The cubic root of 394336881 is about 733.3125748715.

The spelling of 394336881 in words is "three hundred ninety-four million, three hundred thirty-six thousand, eight hundred eighty-one".