204389761 has 4 divisors (see below), whose sum is σ = 206413524. Its totient is φ = 202366000.

The previous prime is 204389743. The next prime is 204389771. The reversal of 204389761 is 167983402.

204389761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 135582736 + 68807025 = 11644^2 + 8295^2 .

It is a cyclic number.

It is not a de Polignac number, because 204389761 - 2¹¹ = 204387713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204389771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1011730 + ... + 1011931.

It is an arithmetic number, because the mean of its divisors is an integer number (51603381).

Almost surely, 2^204389761 is an apocalyptic number.

It is an amenable number.

204389761 is a deficient number, since it is larger than the sum of its proper divisors (2023763).

204389761 is a wasteful number, since it uses less digits than its factorization.

204389761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2023762.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 204389761 is about 14296.4947102428. The cubic root of 204389761 is about 589.0512002903.

The spelling of 204389761 in words is "two hundred four million, three hundred eighty-nine thousand, seven hundred sixty-one".