204423 has 4 divisors (see below), whose sum is σ = 272568. Its totient is φ = 136280.

The previous prime is 204397. The next prime is 204427. The reversal of 204423 is 324402.

It is a happy number.

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 204423 - 2⁶ = 204359 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204427) 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, 34068 + ... + 34073.

It is an arithmetic number, because the mean of its divisors is an integer number (68142).

2²⁰⁴⁴²³ is an apocalyptic number.

204423 is a deficient number, since it is larger than the sum of its proper divisors (68145).

204423 is an equidigital number, since it uses as much as digits as its factorization.

204423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68144.

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 204423 is about 452.1316180052. The cubic root of 204423 is about 58.9083130154.

Adding to 204423 its reverse (324402), we get a palindrome (528825).

The spelling of 204423 in words is "two hundred four thousand, four hundred twenty-three", and thus it is an iban number.