394147917 has 8 divisors (see below), whose sum is σ = 583922880. Its totient is φ = 262765260.

The previous prime is 394147879. The next prime is 394147921. The reversal of 394147917 is 719741493.

It is a de Polignac number, because none of the positive numbers 2^k-394147917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394147997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7299009 + ... + 7299062.

It is an arithmetic number, because the mean of its divisors is an integer number (72990360).

Almost surely, 2^394147917 is an apocalyptic number.

It is an amenable number.

394147917 is a deficient number, since it is larger than the sum of its proper divisors (189774963).

394147917 is a wasteful number, since it uses less digits than its factorization.

394147917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14598080 (or 14598074 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 394147917 is about 19853.1588670418. The cubic root of 394147917 is about 733.1954230792.

The spelling of 394147917 in words is "three hundred ninety-four million, one hundred forty-seven thousand, nine hundred seventeen".