243040289 has 8 divisors (see below), whose sum is σ = 247215360. Its totient is φ = 238881456.

The previous prime is 243040247. The next prime is 243040321. The reversal of 243040289 is 982040342.

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

It is a cyclic number.

It is not a de Polignac number, because 243040289 - 2²⁰ = 241991713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243040489) 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, 28307 + ... + 35879.

It is an arithmetic number, because the mean of its divisors is an integer number (30901920).

Almost surely, 2^243040289 is an apocalyptic number.

It is an amenable number.

243040289 is a deficient number, since it is larger than the sum of its proper divisors (4175071).

243040289 is an equidigital number, since it uses as much as digits as its factorization.

243040289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8119.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 243040289 is about 15589.7494848378. The cubic root of 243040289 is about 624.0596324571.

The spelling of 243040289 in words is "two hundred forty-three million, forty thousand, two hundred eighty-nine".