394378017 has 12 divisors (see below), whose sum is σ = 573806736. Its totient is φ = 238947840.

The previous prime is 394378009. The next prime is 394378031. The reversal of 394378017 is 710873493.

It is not a de Polignac number, because 394378017 - 2³ = 394378009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 394378017.

It is not an unprimeable number, because it can be changed into a prime (394378037) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112353 + ... + 115809.

It is an arithmetic number, because the mean of its divisors is an integer number (47817228).

Almost surely, 2^394378017 is an apocalyptic number.

It is an amenable number.

394378017 is a deficient number, since it is larger than the sum of its proper divisors (179428719).

394378017 is an frugal number, since it uses more digits than its factorization.

394378017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6928 (or 3471 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 394378017 is about 19858.9530690820. The cubic root of 394378017 is about 733.3380729492.

The spelling of 394378017 in words is "three hundred ninety-four million, three hundred seventy-eight thousand, seventeen".