204040243 has 12 divisors (see below), whose sum is σ = 226807560. Its totient is φ = 183397280.

The previous prime is 204040223. The next prime is 204040247. The reversal of 204040243 is 342040402.

It is not a de Polignac number, because 204040243 - 2²⁵ = 170485811 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204040243.

It is not an unprimeable number, because it can be changed into a prime (204040247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1296 + ... + 20242.

It is an arithmetic number, because the mean of its divisors is an integer number (18900630).

Almost surely, 2^204040243 is an apocalyptic number.

204040243 is a deficient number, since it is larger than the sum of its proper divisors (22767317).

204040243 is a wasteful number, since it uses less digits than its factorization.

204040243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19058 (or 19047 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 204040243 is about 14284.2655744004. The cubic root of 204040243 is about 588.7152384727.

Adding to 204040243 its reverse (342040402), we get a palindrome (546080645).

The spelling of 204040243 in words is "two hundred four million, forty thousand, two hundred forty-three".