204439 has 2 divisors, whose sum is σ = 204440. Its totient is φ = 204438.

The previous prime is 204437. The next prime is 204443. The reversal of 204439 is 934402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 204439 - 2¹ = 204437 is a prime.

Together with 204437, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102219 + 102220.

It is an arithmetic number, because the mean of its divisors is an integer number (102220).

2²⁰⁴⁴³⁹ is an apocalyptic number.

204439 is a deficient number, since it is larger than the sum of its proper divisors (1).

204439 is an equidigital number, since it uses as much as digits as its factorization.

204439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 204439 is about 452.1493116217. The cubic root of 204439 is about 58.9098498751.

The spelling of 204439 in words is "two hundred four thousand, four hundred thirty-nine".