243218 has 4 divisors (see below), whose sum is σ = 364830. Its totient is φ = 121608.

The previous prime is 243209. The next prime is 243227. The reversal of 243218 is 812342.

243218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 812342 = 2 ⋅406171.

It is an interprime number because it is at equal distance from previous prime (243209) and next prime (243227).

It can be written as a sum of positive squares in only one way, i.e., 243049 + 169 = 493^2 + 13^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 243218.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 243218.

It is an unprimeable number.

243218 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60803 + ... + 60806.

2²⁴³²¹⁸ is an apocalyptic number.

243218 is a deficient number, since it is larger than the sum of its proper divisors (121612).

243218 is a wasteful number, since it uses less digits than its factorization.

243218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121611.

The product of its digits is 384, while the sum is 20.

The square root of 243218 is about 493.1713698097. The cubic root of 243218 is about 62.4211699483.

It can be divided in two parts, 2 and 43218, that multiplied together give a square (86436 = 294²).

The spelling of 243218 in words is "two hundred forty-three thousand, two hundred eighteen".