204979399 has 4 divisors (see below), whose sum is σ = 207009000. Its totient is φ = 202949800.

The previous prime is 204979351. The next prime is 204979451. The reversal of 204979399 is 993979402.

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 204979399 - 2⁹ = 204978887 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 (204979309) 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 3 ways as a sum of consecutive naturals, for example, 1014649 + ... + 1014850.

It is an arithmetic number, because the mean of its divisors is an integer number (51752250).

Almost surely, 2^204979399 is an apocalyptic number.

204979399 is a deficient number, since it is larger than the sum of its proper divisors (2029601).

204979399 is a wasteful number, since it uses less digits than its factorization.

204979399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2029600.

The product of its (nonzero) digits is 1102248, while the sum is 52.

The square root of 204979399 is about 14317.1016270752. The cubic root of 204979399 is about 589.6171019389.

The spelling of 204979399 in words is "two hundred four million, nine hundred seventy-nine thousand, three hundred ninety-nine".