394716789 has 12 divisors (see below), whose sum is σ = 572515372. Its totient is φ = 262051200.

The previous prime is 394716781. The next prime is 394716809. The reversal of 394716789 is 987617493.

It is a happy number.

394716789 is a `hidden beast` number, since 39 + 471 + 67 + 89 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 276124689 + 118592100 = 16617^2 + 10890^2 .

It is not a de Polignac number, because 394716789 - 2³ = 394716781 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 (394716781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88822 + ... + 93159.

Almost surely, 2^394716789 is an apocalyptic number.

It is an amenable number.

394716789 is a deficient number, since it is larger than the sum of its proper divisors (177798583).

394716789 is a wasteful number, since it uses less digits than its factorization.

394716789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182228 (or 182225 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 394716789 is about 19867.4806908173. The cubic root of 394716789 is about 733.5479927837.

It can be divided in two parts, 3947 and 16789, that added together give a 4-th power (20736 = 12⁴).

The spelling of 394716789 in words is "three hundred ninety-four million, seven hundred sixteen thousand, seven hundred eighty-nine".