204400243 has 8 divisors (see below), whose sum is σ = 207270000. Its totient is φ = 201546240.

The previous prime is 204400187. The next prime is 204400253. The reversal of 204400243 is 342004402.

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

It is a cyclic number.

It is not a de Polignac number, because 204400243 - 2¹³ = 204392051 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 204400243.

It is not an unprimeable number, because it can be changed into a prime (204400253) 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, 23508 + ... + 31006.

It is an arithmetic number, because the mean of its divisors is an integer number (25908750).

Almost surely, 2^204400243 is an apocalyptic number.

204400243 is a deficient number, since it is larger than the sum of its proper divisors (2869757).

204400243 is an equidigital number, since it uses as much as digits as its factorization.

204400243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7877.

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

The square root of 204400243 is about 14296.8612989005. The cubic root of 204400243 is about 589.0612698246.

Adding to 204400243 its reverse (342004402), we get a palindrome (546404645).

The spelling of 204400243 in words is "two hundred four million, four hundred thousand, two hundred forty-three".