204120399 has 16 divisors (see below), whose sum is σ = 321075200. Its totient is φ = 112877280.

The previous prime is 204120383. The next prime is 204120403. The reversal of 204120399 is 993021402.

It is not a de Polignac number, because 204120399 - 2⁴ = 204120383 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 (204120599) 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 15 ways as a sum of consecutive naturals, for example, 156124 + ... + 157425.

It is an arithmetic number, because the mean of its divisors is an integer number (20067200).

Almost surely, 2^204120399 is an apocalyptic number.

204120399 is a deficient number, since it is larger than the sum of its proper divisors (116954801).

204120399 is a wasteful number, since it uses less digits than its factorization.

204120399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313590.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 204120399 is about 14287.0710434294. The cubic root of 204120399 is about 588.7923194773.

The spelling of 204120399 in words is "two hundred four million, one hundred twenty thousand, three hundred ninety-nine".