204395989 has 16 divisors (see below), whose sum is σ = 244203520. Its totient is φ = 167384880.

The previous prime is 204395987. The next prime is 204395999. The reversal of 204395989 is 989593402.

It is a cyclic number.

It is not a de Polignac number, because 204395989 - 2¹ = 204395987 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 (204395987) 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, 11182 + ... + 23104.

It is an arithmetic number, because the mean of its divisors is an integer number (15262720).

Almost surely, 2^204395989 is an apocalyptic number.

It is an amenable number.

204395989 is a deficient number, since it is larger than the sum of its proper divisors (39807531).

204395989 is a wasteful number, since it uses less digits than its factorization.

204395989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12040.

The product of its (nonzero) digits is 699840, while the sum is 49.

The square root of 204395989 is about 14296.7125242134. The cubic root of 204395989 is about 589.0571832606.

The spelling of 204395989 in words is "two hundred four million, three hundred ninety-five thousand, nine hundred eighty-nine".