204389 has 4 divisors (see below), whose sum is σ = 205356. Its totient is φ = 203424.

The previous prime is 204377. The next prime is 204397. The reversal of 204389 is 983402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 16900 + 187489 = 130^2 + 433^2 .

It is a cyclic number.

It is not a de Polignac number, because 204389 - 2⁸ = 204133 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 (204319) 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, 14 + ... + 639.

It is an arithmetic number, because the mean of its divisors is an integer number (51339).

2²⁰⁴³⁸⁹ is an apocalyptic number.

It is an amenable number.

204389 is a deficient number, since it is larger than the sum of its proper divisors (967).

204389 is an equidigital number, since it uses as much as digits as its factorization.

204389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 204389 is about 452.0940167708. The cubic root of 204389 is about 58.9050469222.

The spelling of 204389 in words is "two hundred four thousand, three hundred eighty-nine".