43218 has 30 divisors (see below), whose sum is σ = 109239. Its totient is φ = 12348.

The previous prime is 43207. The next prime is 43223. The reversal of 43218 is 81234.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21609 + 21609 = 147^2 + 147^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=147.

It is a Harshad number since it is a multiple of its sum of digits (18).

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

Its product of digits (192) is a multiple of the sum of its prime divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 43218.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 6171 + ... + 6177.

2⁴³²¹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43218

43218 is an abundant number, since it is smaller than the sum of its proper divisors (66021).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

43218 is an equidigital number, since it uses as much as digits as its factorization.

43218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36 (or 12 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 43218 is about 207.8893936688. The cubic root of 43218 is about 35.0930855448.

Multiplying 43218 by its sum of digits (18), we get a square (777924 = 882²).

43218 divided by its sum of digits (18) gives a 4-th power (2401 = 7⁴).

It can be divided in two parts, 432 and 18, that multiplied together give a 5-th power (7776 = 6⁵).

The spelling of 43218 in words is "forty-three thousand, two hundred eighteen".