394468639 has 16 divisors (see below), whose sum is σ = 408550240. Its totient is φ = 380712960.

The previous prime is 394468637. The next prime is 394468651. The reversal of 394468639 is 936864493.

It is a cyclic number.

It is not a de Polignac number, because 394468639 - 2¹ = 394468637 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 (394468637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 964267 + ... + 964675.

It is an arithmetic number, because the mean of its divisors is an integer number (25534390).

Almost surely, 2^394468639 is an apocalyptic number.

394468639 is a deficient number, since it is larger than the sum of its proper divisors (14081601).

394468639 is a wasteful number, since it uses less digits than its factorization.

394468639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730.

The product of its digits is 3359232, while the sum is 52.

The square root of 394468639 is about 19861.2345789480. The cubic root of 394468639 is about 733.3942385825.

The spelling of 394468639 in words is "three hundred ninety-four million, four hundred sixty-eight thousand, six hundred thirty-nine".