243318 has 16 divisors (see below), whose sum is σ = 492480. Its totient is φ = 80136.

The previous prime is 243311. The next prime is 243343. The reversal of 243318 is 813342.

It is a happy number.

It is a Curzon number.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 243294 and 243303.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 243318.

It is not an unprimeable number, because it can be changed into a prime (243311) by changing a digit.

243318 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 in 7 ways as a sum of consecutive naturals, for example, 453 + ... + 831.

It is an arithmetic number, because the mean of its divisors is an integer number (30780).

2²⁴³³¹⁸ is an apocalyptic number.

243318 is an abundant number, since it is smaller than the sum of its proper divisors (249162).

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

243318 is a wasteful number, since it uses less digits than its factorization.

243318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491.

The product of its digits is 576, while the sum is 21.

The square root of 243318 is about 493.2727440271. The cubic root of 243318 is about 62.4297236761.

It can be divided in two parts, 243 and 318, that added together give a triangular number (561 = T₃₃).

The spelling of 243318 in words is "two hundred forty-three thousand, three hundred eighteen".