394538769 has 15 divisors (see below), whose sum is σ = 589639897. Its totient is φ = 262906668.

The previous prime is 394538761. The next prime is 394538779. The reversal of 394538769 is 967835493.

The square root of 394538769 is 19863.

It is a perfect power (a square), and thus also a powerful number.

394538769 is a `hidden beast` number, since 39 + 4 + 538 + 76 + 9 = 666.

It is not a de Polignac number, because 394538769 - 2³ = 394538761 is a prime.

It is a super-2 number, since 2×394538769² = 311321680488070722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394538761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 177664 + ... + 179870.

Almost surely, 2^394538769 is an apocalyptic number.

394538769 is the 19863-rd square number.

394538769 is the 9932-nd centered octagonal number.

It is an amenable number.

394538769 is a deficient number, since it is larger than the sum of its proper divisors (195101128).

394538769 is an frugal number, since it uses more digits than its factorization.

394538769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4426 (or 2210 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 54.

The cubic root of 394538769 is about 733.4376977959.

The spelling of 394538769 in words is "three hundred ninety-four million, five hundred thirty-eight thousand, seven hundred sixty-nine".