204989 has 4 divisors (see below), whose sum is σ = 205920. Its totient is φ = 204060.

The previous prime is 204983. The next prime is 205019. The reversal of 204989 is 989402.

204989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 204989 - 2⁴ = 204973 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 (204983) 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, 74 + ... + 644.

It is an arithmetic number, because the mean of its divisors is an integer number (51480).

2²⁰⁴⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

204989 is a deficient number, since it is larger than the sum of its proper divisors (931).

204989 is an equidigital number, since it uses as much as digits as its factorization.

204989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 204989 is about 452.7571092760. The cubic root of 204989 is about 58.9626307458.

The spelling of 204989 in words is "two hundred four thousand, nine hundred eighty-nine".