243427989 has 8 divisors (see below), whose sum is σ = 370937920. Its totient is φ = 139101696.

The previous prime is 243427979. The next prime is 243427997. The reversal of 243427989 is 989724342.

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

It is not a de Polignac number, because 243427989 - 2⁷ = 243427861 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 (243427909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5795884 + ... + 5795925.

It is an arithmetic number, because the mean of its divisors is an integer number (46367240).

Almost surely, 2^243427989 is an apocalyptic number.

It is an amenable number.

243427989 is a deficient number, since it is larger than the sum of its proper divisors (127509931).

243427989 is a wasteful number, since it uses less digits than its factorization.

243427989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11591819.

The product of its digits is 870912, while the sum is 48.

The square root of 243427989 is about 15602.1789824370. The cubic root of 243427989 is about 624.3912912971.

The spelling of 243427989 in words is "two hundred forty-three million, four hundred twenty-seven thousand, nine hundred eighty-nine".