204139789 has 16 divisors (see below), whose sum is σ = 245329920. Its totient is φ = 166074480.

The previous prime is 204139777. The next prime is 204139807. The reversal of 204139789 is 987931402.

204139789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 204139789 - 2⁹ = 204139277 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 (204139759) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16252 + ... + 25930.

It is an arithmetic number, because the mean of its divisors is an integer number (15333120).

Almost surely, 2^204139789 is an apocalyptic number.

It is an amenable number.

204139789 is a deficient number, since it is larger than the sum of its proper divisors (41190131).

204139789 is a wasteful number, since it uses less digits than its factorization.

204139789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9840.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 204139789 is about 14287.7496128677. The cubic root of 204139789 is about 588.8109625945.

The spelling of 204139789 in words is "two hundred four million, one hundred thirty-nine thousand, seven hundred eighty-nine".