204987 has 4 divisors (see below), whose sum is σ = 273320. Its totient is φ = 136656.

The previous prime is 204983. The next prime is 205019. The reversal of 204987 is 789402.

204987 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.

It is not a de Polignac number, because 204987 - 2² = 204983 is a prime.

It is a D-number.

It is a Duffinian 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, 34162 + ... + 34167.

It is an arithmetic number, because the mean of its divisors is an integer number (68330).

2²⁰⁴⁹⁸⁷ is an apocalyptic number.

204987 is a deficient number, since it is larger than the sum of its proper divisors (68333).

204987 is an equidigital number, since it uses as much as digits as its factorization.

204987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68332.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 204987 is about 452.7549005809. The cubic root of 204987 is about 58.9624389865.

The spelling of 204987 in words is "two hundred four thousand, nine hundred eighty-seven".