243678 has 16 divisors (see below), whose sum is σ = 516240. Its totient is φ = 76416.

The previous prime is 243673. The next prime is 243701. The reversal of 243678 is 876342.

243678 is nontrivially palindromic in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243671) by changing a digit.

243678 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, 1093 + ... + 1296.

It is an arithmetic number, because the mean of its divisors is an integer number (32265).

2²⁴³⁶⁷⁸ is an apocalyptic number.

243678 is an abundant number, since it is smaller than the sum of its proper divisors (272562).

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

243678 is a wasteful number, since it uses less digits than its factorization.

243678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2411.

The product of its digits is 8064, while the sum is 30.

The square root of 243678 is about 493.6375188334. The cubic root of 243678 is about 62.4604977050.

The spelling of 243678 in words is "two hundred forty-three thousand, six hundred seventy-eight".