394198809 has 8 divisors (see below), whose sum is σ = 525759072. Its totient is φ = 262718880.

The previous prime is 394198801. The next prime is 394198813. The reversal of 394198809 is 908891493.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 394198809 - 2³ = 394198801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (394198801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7507 + ... + 29064.

It is an arithmetic number, because the mean of its divisors is an integer number (65719884).

Almost surely, 2^394198809 is an apocalyptic number.

It is an amenable number.

394198809 is a deficient number, since it is larger than the sum of its proper divisors (131560263).

394198809 is a wasteful number, since it uses less digits than its factorization.

394198809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40167.

The product of its (nonzero) digits is 559872, while the sum is 51.

The square root of 394198809 is about 19854.4405360614. The cubic root of 394198809 is about 733.2269782170.

The spelling of 394198809 in words is "three hundred ninety-four million, one hundred ninety-eight thousand, eight hundred nine".