243618 has 16 divisors (see below), whose sum is σ = 513120. Its totient is φ = 76896.

The previous prime is 243613. The next prime is 243623. The reversal of 243618 is 816342.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (243613) and next prime (243623).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243613) by changing a digit.

243618 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 955 + ... + 1182.

It is an arithmetic number, because the mean of its divisors is an integer number (32070).

2²⁴³⁶¹⁸ is an apocalyptic number.

243618 is an abundant number, since it is smaller than the sum of its proper divisors (269502).

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

243618 is a wasteful number, since it uses less digits than its factorization.

243618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2161.

The product of its digits is 1152, while the sum is 24.

The square root of 243618 is about 493.5767417535. The cubic root of 243618 is about 62.4553708060.

It can be divided in two parts, 243 and 618, that added together give a triangular number (861 = T₄₁).

The spelling of 243618 in words is "two hundred forty-three thousand, six hundred eighteen".