204117999 has 16 divisors (see below), whose sum is σ = 280651392. Its totient is φ = 131894048.

The previous prime is 204117989. The next prime is 204118003. The reversal of 204117999 is 999711402.

It is a cyclic number.

It is not a de Polignac number, because 204117999 - 2⁴ = 204117983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204117999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204117959) 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 in 15 ways as a sum of consecutive naturals, for example, 5464 + ... + 20930.

It is an arithmetic number, because the mean of its divisors is an integer number (17540712).

Almost surely, 2^204117999 is an apocalyptic number.

204117999 is a deficient number, since it is larger than the sum of its proper divisors (76533393).

204117999 is a wasteful number, since it uses less digits than its factorization.

204117999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15606.

The product of its (nonzero) digits is 40824, while the sum is 42.

The square root of 204117999 is about 14286.9870511595. The cubic root of 204117999 is about 588.7900118407.

The spelling of 204117999 in words is "two hundred four million, one hundred seventeen thousand, nine hundred ninety-nine".