204400323403 has 4 divisors (see below), whose sum is σ = 204841793248. Its totient is φ = 203958853560.

The previous prime is 204400323373. The next prime is 204400323419. The reversal of 204400323403 is 304323004402.

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 204400323403 - 2¹⁷ = 204400192331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204400323433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220734228 + ... + 220735153.

It is an arithmetic number, because the mean of its divisors is an integer number (51210448312).

Almost surely, 2^204400323403 is an apocalyptic number.

204400323403 is a deficient number, since it is larger than the sum of its proper divisors (441469845).

204400323403 is an equidigital number, since it uses as much as digits as its factorization.

204400323403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441469844.

The product of its (nonzero) digits is 6912, while the sum is 25.

Adding to 204400323403 its reverse (304323004402), we get a palindrome (508723327805).

The spelling of 204400323403 in words is "two hundred four billion, four hundred million, three hundred twenty-three thousand, four hundred three".