394871317 has 4 divisors (see below), whose sum is σ = 398781036. Its totient is φ = 390961600.

The previous prime is 394871303. The next prime is 394871327. The reversal of 394871317 is 713178493.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 387656721 + 7214596 = 19689^2 + 2686^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394871317 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 (394871327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1954708 + ... + 1954909.

It is an arithmetic number, because the mean of its divisors is an integer number (99695259).

Almost surely, 2^394871317 is an apocalyptic number.

It is an amenable number.

394871317 is a deficient number, since it is larger than the sum of its proper divisors (3909719).

394871317 is a wasteful number, since it uses less digits than its factorization.

394871317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3909718.

The product of its digits is 127008, while the sum is 43.

The square root of 394871317 is about 19871.3692784368. The cubic root of 394871317 is about 733.6437060633.

It can be divided in two parts, 39487 and 1317, that added together give a palindrome (40804).

The spelling of 394871317 in words is "three hundred ninety-four million, eight hundred seventy-one thousand, three hundred seventeen".