204973909 has 12 divisors (see below), whose sum is σ = 243514944. Its totient is φ = 171951864.

The previous prime is 204973897. The next prime is 204973931. The reversal of 204973909 is 909379402.

It is not a de Polignac number, because 204973909 - 2⁵ = 204973877 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 (204976909) 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, 42199 + ... + 46804.

It is an arithmetic number, because the mean of its divisors is an integer number (20292912).

Almost surely, 2^204973909 is an apocalyptic number.

It is an amenable number.

204973909 is a deficient number, since it is larger than the sum of its proper divisors (38541035).

204973909 is an equidigital number, since it uses as much as digits as its factorization.

204973909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89064 (or 89057 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 204973909 is about 14316.9098970413. The cubic root of 204973909 is about 589.6118379517.

The spelling of 204973909 in words is "two hundred four million, nine hundred seventy-three thousand, nine hundred nine".