204395 has 4 divisors (see below), whose sum is σ = 245280. Its totient is φ = 163512.

The previous prime is 204377. The next prime is 204397. The reversal of 204395 is 593402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 204395 - 2⁶ = 204331 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204395.

It is not an unprimeable number, because it can be changed into a prime (204397) 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 3 ways as a sum of consecutive naturals, for example, 20435 + ... + 20444.

It is an arithmetic number, because the mean of its divisors is an integer number (61320).

2²⁰⁴³⁹⁵ is an apocalyptic number.

204395 is a deficient number, since it is larger than the sum of its proper divisors (40885).

204395 is an equidigital number, since it uses as much as digits as its factorization.

204395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40884.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 204395 is about 452.1006525100. The cubic root of 204395 is about 58.9056233179.

Adding to 204395 its reverse (593402), we get a palindrome (797797).

The spelling of 204395 in words is "two hundred four thousand, three hundred ninety-five".