204139 has 8 divisors (see below), whose sum is σ = 225792. Its totient is φ = 183360.

The previous prime is 204137. The next prime is 204143. The reversal of 204139 is 931402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 204139 - 2¹ = 204137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204133) 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 7 ways as a sum of consecutive naturals, for example, 342 + ... + 724.

It is an arithmetic number, because the mean of its divisors is an integer number (28224).

2²⁰⁴¹³⁹ is an apocalyptic number.

204139 is a deficient number, since it is larger than the sum of its proper divisors (21653).

204139 is a wasteful number, since it uses less digits than its factorization.

204139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 204139 is about 451.8174410091. The cubic root of 204139 is about 58.8810204009.

It can be divided in two parts, 2041 and 39, that added together give a triangular number (2080 = T₆₄).

The spelling of 204139 in words is "two hundred four thousand, one hundred thirty-nine".