204889 has 4 divisors (see below), whose sum is σ = 205840. Its totient is φ = 203940.

The previous prime is 204887. The next prime is 204913. The reversal of 204889 is 988402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 204889 - 2¹ = 204887 is a prime.

It is a Duffinian number.

204889 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 204889.

It is not an unprimeable number, because it can be changed into a prime (204887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22 + ... + 640.

It is an arithmetic number, because the mean of its divisors is an integer number (51460).

2²⁰⁴⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

204889 is a deficient number, since it is larger than the sum of its proper divisors (951).

204889 is an equidigital number, since it uses as much as digits as its factorization.

204889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 204889 is about 452.6466613154. The cubic root of 204889 is about 58.9530412522.

The spelling of 204889 in words is "two hundred four thousand, eight hundred eighty-nine".