204089999 has 4 divisors (see below), whose sum is σ = 204827064. Its totient is φ = 203352936.

The previous prime is 204089953. The next prime is 204090013. The reversal of 204089999 is 999980402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204089999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204089929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368117 + ... + 368670.

It is an arithmetic number, because the mean of its divisors is an integer number (51206766).

Almost surely, 2^204089999 is an apocalyptic number.

204089999 is a deficient number, since it is larger than the sum of its proper divisors (737065).

204089999 is an equidigital number, since it uses as much as digits as its factorization.

204089999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737064.

The product of its (nonzero) digits is 419904, while the sum is 50.

The square root of 204089999 is about 14286.0071048561. The cubic root of 204089999 is about 588.7630880771.

The spelling of 204089999 in words is "two hundred four million, eighty-nine thousand, nine hundred ninety-nine".