204393 has 8 divisors (see below), whose sum is σ = 311488. Its totient is φ = 116784.

The previous prime is 204377. The next prime is 204397. The reversal of 204393 is 393402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 204393 - 2⁴ = 204377 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 9733 = 204393 / (2 + 0 + 4 + 3 + 9 + 3).

It is a Duffinian number.

It is a Curzon number.

204393 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (204397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4846 + ... + 4887.

It is an arithmetic number, because the mean of its divisors is an integer number (38936).

2²⁰⁴³⁹³ is an apocalyptic number.

It is an amenable number.

204393 is a deficient number, since it is larger than the sum of its proper divisors (107095).

204393 is an equidigital number, since it uses as much as digits as its factorization.

204393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9743.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 204393 is about 452.0984406078. The cubic root of 204393 is about 58.9054311873.

Adding to 204393 its reverse (393402), we get a palindrome (597795).

The spelling of 204393 in words is "two hundred four thousand, three hundred ninety-three".