394118809 has 12 divisors (see below), whose sum is σ = 459929124. Its totient is φ = 336737184.

The previous prime is 394118797. The next prime is 394118819. The reversal of 394118809 is 908811493.

It can be written as a sum of positive squares in 2 ways, for example, as 11055625 + 383063184 = 3325^2 + 19572^2 .

It is not a de Polignac number, because 394118809 - 2⁹ = 394118297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394118819) 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, 2847 + ... + 28219.

It is an arithmetic number, because the mean of its divisors is an integer number (38327427).

Almost surely, 2^394118809 is an apocalyptic number.

It is an amenable number.

394118809 is a deficient number, since it is larger than the sum of its proper divisors (65810315).

394118809 is a wasteful number, since it uses less digits than its factorization.

394118809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25704 (or 25697 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 394118809 is about 19852.4257711747. The cubic root of 394118809 is about 733.1773736982.

The spelling of 394118809 in words is "three hundred ninety-four million, one hundred eighteen thousand, eight hundred nine".