394491717 has 6 divisors (see below), whose sum is σ = 569821382. Its totient is φ = 262994472.

The previous prime is 394491707. The next prime is 394491739. The reversal of 394491717 is 717194493.

394491717 is a `hidden beast` number, since 3 + 94 + 491 + 71 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 302446881 + 92044836 = 17391^2 + 9594^2 .

It is not a de Polignac number, because 394491717 - 2¹⁹ = 393967429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394491707) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21916198 + ... + 21916215.

Almost surely, 2^394491717 is an apocalyptic number.

It is an amenable number.

394491717 is a deficient number, since it is larger than the sum of its proper divisors (175329665).

394491717 is a wasteful number, since it uses less digits than its factorization.

394491717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43832419 (or 43832416 counting only the distinct ones).

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

The square root of 394491717 is about 19861.8155514545. The cubic root of 394491717 is about 733.4085404733.

The spelling of 394491717 in words is "three hundred ninety-four million, four hundred ninety-one thousand, seven hundred seventeen".