394787789 has 12 divisors (see below), whose sum is σ = 434686560. Its totient is φ = 358281000.

The previous prime is 394787779. The next prime is 394787797. The reversal of 394787789 is 987787493.

It is a de Polignac number, because none of the positive numbers 2^k-394787789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394787779) 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, 77264 + ... + 82214.

It is an arithmetic number, because the mean of its divisors is an integer number (36223880).

Almost surely, 2^394787789 is an apocalyptic number.

It is an amenable number.

394787789 is a deficient number, since it is larger than the sum of its proper divisors (39898771).

394787789 is a wasteful number, since it uses less digits than its factorization.

394787789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5632 (or 5621 counting only the distinct ones).

The product of its digits is 21337344, while the sum is 62.

The square root of 394787789 is about 19869.2674500093. The cubic root of 394787789 is about 733.5919726587.

The spelling of 394787789 in words is "three hundred ninety-four million, seven hundred eighty-seven thousand, seven hundred eighty-nine".