204345989 has 8 divisors (see below), whose sum is σ = 209136000. Its totient is φ = 199574496.

The previous prime is 204345959. The next prime is 204345997. The reversal of 204345989 is 989543402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204345989 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 (204345949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19097 + ... + 27809.

It is an arithmetic number, because the mean of its divisors is an integer number (26142000).

Almost surely, 2^204345989 is an apocalyptic number.

It is an amenable number.

204345989 is a deficient number, since it is larger than the sum of its proper divisors (4790011).

204345989 is an equidigital number, since it uses as much as digits as its factorization.

204345989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9259.

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 204345989 is about 14294.9637635078. The cubic root of 204345989 is about 589.0091469933.

The spelling of 204345989 in words is "two hundred four million, three hundred forty-five thousand, nine hundred eighty-nine".