204749 has 2 divisors, whose sum is σ = 204750. Its totient is φ = 204748.

The previous prime is 204733. The next prime is 204751. The reversal of 204749 is 947402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198025 + 6724 = 445^2 + 82^2 .

It is a cyclic number.

It is not a de Polignac number, because 204749 - 2⁴ = 204733 is a prime.

It is a Sophie Germain prime.

Together with 204751, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102374 + 102375.

It is an arithmetic number, because the mean of its divisors is an integer number (102375).

2²⁰⁴⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

204749 is a deficient number, since it is larger than the sum of its proper divisors (1).

204749 is an equidigital number, since it uses as much as digits as its factorization.

204749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 204749 is about 452.4919888794. The cubic root of 204749 is about 58.9396107177.

The spelling of 204749 in words is "two hundred four thousand, seven hundred forty-nine".