204203423 has 2 divisors, whose sum is σ = 204203424. Its totient is φ = 204203422.

The previous prime is 204203399. The next prime is 204203437. The reversal of 204203423 is 324302402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204203423 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 204203395 and 204203404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204203443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102101711 + 102101712.

It is an arithmetic number, because the mean of its divisors is an integer number (102101712).

Almost surely, 2^204203423 is an apocalyptic number.

204203423 is a deficient number, since it is larger than the sum of its proper divisors (1).

204203423 is an equidigital number, since it uses as much as digits as its factorization.

204203423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 204203423 is about 14289.9763120867. The cubic root of 204203423 is about 588.8721371855.

Adding to 204203423 its reverse (324302402), we get a palindrome (528505825).

The spelling of 204203423 in words is "two hundred four million, two hundred three thousand, four hundred twenty-three".