204080209 has 4 divisors (see below), whose sum is σ = 204118180. Its totient is φ = 204042240.

The previous prime is 204080141. The next prime is 204080213. The reversal of 204080209 is 902080402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 164352400 + 39727809 = 12820^2 + 6303^2 .

It is a cyclic number.

It is not a de Polignac number, because 204080209 - 2⁹ = 204079697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204080299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9264 + ... + 22225.

It is an arithmetic number, because the mean of its divisors is an integer number (51029545).

Almost surely, 2^204080209 is an apocalyptic number.

It is an amenable number.

204080209 is a deficient number, since it is larger than the sum of its proper divisors (37971).

204080209 is an equidigital number, since it uses as much as digits as its factorization.

204080209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37970.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 204080209 is about 14285.6644577702. The cubic root of 204080209 is about 588.7536737945.

The spelling of 204080209 in words is "two hundred four million, eighty thousand, two hundred nine".