204949 has 4 divisors (see below), whose sum is σ = 205920. Its totient is φ = 203980.

The previous prime is 204947. The next prime is 204973. The reversal of 204949 is 949402.

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 204949 - 2¹ = 204947 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 (204947) 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, 19 + ... + 640.

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

2²⁰⁴⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

204949 is a deficient number, since it is larger than the sum of its proper divisors (971).

204949 is an equidigital number, since it uses as much as digits as its factorization.

204949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 204949 is about 452.7129333253. The cubic root of 204949 is about 58.9587953227.

It can be divided in two parts, 20494 and 9, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 204949 in words is "two hundred four thousand, nine hundred forty-nine".