394991375 has 8 divisors (see below), whose sum is σ = 492949392. Its totient is φ = 315993000.

The previous prime is 394991357. The next prime is 394991381. The reversal of 394991375 is 573199493.

It is a de Polignac number, because none of the positive numbers 2^k-394991375 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1579841 + ... + 1580090.

It is an arithmetic number, because the mean of its divisors is an integer number (61618674).

Almost surely, 2^394991375 is an apocalyptic number.

394991375 is a deficient number, since it is larger than the sum of its proper divisors (97958017).

394991375 is an equidigital number, since it uses as much as digits as its factorization.

394991375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3159946 (or 3159936 counting only the distinct ones).

The product of its digits is 918540, while the sum is 50.

The square root of 394991375 is about 19874.3899277437. The cubic root of 394991375 is about 733.7180516936.

The spelling of 394991375 in words is "three hundred ninety-four million, nine hundred ninety-one thousand, three hundred seventy-five".