204404909 has 8 divisors (see below), whose sum is σ = 211791480. Its totient is φ = 197116416.

The previous prime is 204404881. The next prime is 204404947. The reversal of 204404909 is 909404402.

It can be written as a sum of positive squares in 4 ways, for example, as 22829284 + 181575625 = 4778^2 + 13475^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 204404909 - 2⁸ = 204404653 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 (204404999) 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, 20264 + ... + 28625.

It is an arithmetic number, because the mean of its divisors is an integer number (26473935).

Almost surely, 2^204404909 is an apocalyptic number.

It is an amenable number.

204404909 is a deficient number, since it is larger than the sum of its proper divisors (7386571).

204404909 is a wasteful number, since it uses less digits than its factorization.

204404909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49039.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 204404909 is about 14297.0244806393. The cubic root of 204404909 is about 589.0657521072.

The spelling of 204404909 in words is "two hundred four million, four hundred four thousand, nine hundred nine".