394278289889 has 32 divisors (see below), whose sum is σ = 461398339584. Its totient is φ = 333262226880.

The previous prime is 394278289829. The next prime is 394278289907. The reversal of 394278289889 is 988982872493.

It is a de Polignac number, because none of the positive numbers 2^k-394278289889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394278289829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9930932 + ... + 9970554.

It is an arithmetic number, because the mean of its divisors is an integer number (14418698112).

Almost surely, 2^394278289889 is an apocalyptic number.

It is an amenable number.

394278289889 is a deficient number, since it is larger than the sum of its proper divisors (67120049695).

394278289889 is a wasteful number, since it uses less digits than its factorization.

394278289889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40757.

The product of its digits is 1003290624, while the sum is 77.

The spelling of 394278289889 in words is "three hundred ninety-four billion, two hundred seventy-eight million, two hundred eighty-nine thousand, eight hundred eighty-nine".