204939 has 12 divisors (see below), whose sum is σ = 338416. Its totient is φ = 117072.

The previous prime is 204931. The next prime is 204947. The reversal of 204939 is 939402.

It is an interprime number because it is at equal distance from previous prime (204931) and next prime (204947).

It is not a de Polignac number, because 204939 - 2³ = 204931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204931) 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 11 ways as a sum of consecutive naturals, for example, 1564 + ... + 1689.

2²⁰⁴⁹³⁹ is an apocalyptic number.

204939 is a deficient number, since it is larger than the sum of its proper divisors (133477).

204939 is a wasteful number, since it uses less digits than its factorization.

204939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3266 (or 3263 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 204939 is about 452.7018886641. The cubic root of 204939 is about 58.9578363889.

It can be divided in two parts, 20493 and 9, that added together give a palindrome (20502).

The spelling of 204939 in words is "two hundred four thousand, nine hundred thirty-nine".