43218189 has 12 divisors (see below), whose sum is σ = 71344416. Its totient is φ = 24696072.

The previous prime is 43218181. The next prime is 43218221. The reversal of 43218189 is 98181234.

43218189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 43218189 - 2³ = 43218181 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43218181) 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 11 ways as a sum of consecutive naturals, for example, 342939 + ... + 343064.

It is an arithmetic number, because the mean of its divisors is an integer number (5945368).

Almost surely, 2^43218189 is an apocalyptic number.

It is an amenable number.

43218189 is a deficient number, since it is larger than the sum of its proper divisors (28126227).

43218189 is a wasteful number, since it uses less digits than its factorization.

43218189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686016 (or 686013 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 43218189 is about 6574.0542285564. The cubic root of 43218189 is about 350.9313670078.

The spelling of 43218189 in words is "forty-three million, two hundred eighteen thousand, one hundred eighty-nine".