204459 has 16 divisors (see below), whose sum is σ = 305280. Its totient is φ = 120960.

The previous prime is 204443. The next prime is 204461. The reversal of 204459 is 954402.

It is not a de Polignac number, because 204459 - 2⁴ = 204443 is a prime.

It is an Ulam number.

204459 is a modest number, since divided by 459 gives 204 as remainder.

204459 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (204439) 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 in 15 ways as a sum of consecutive naturals, for example, 864 + ... + 1074.

It is an arithmetic number, because the mean of its divisors is an integer number (19080).

2²⁰⁴⁴⁵⁹ is an apocalyptic number.

204459 is a deficient number, since it is larger than the sum of its proper divisors (100821).

204459 is a wasteful number, since it uses less digits than its factorization.

204459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 204459 is about 452.1714276688. The cubic root of 204459 is about 58.9117708370.

It can be divided in two parts, 204 and 459, that multiplied together give a square (93636 = 306²).

The spelling of 204459 in words is "two hundred four thousand, four hundred fifty-nine".