243918 has 16 divisors (see below), whose sum is σ = 542160. Its totient is φ = 81288.

The previous prime is 243917. The next prime is 243931. The reversal of 243918 is 819342.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 243891 and 243900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243911) by changing a digit.

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, 2205 + ... + 2312.

It is an arithmetic number, because the mean of its divisors is an integer number (33885).

2²⁴³⁹¹⁸ is an apocalyptic number.

243918 is an abundant number, since it is smaller than the sum of its proper divisors (298242).

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

243918 is a wasteful number, since it uses less digits than its factorization.

243918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4528 (or 4522 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 243918 is about 493.8805523606. The cubic root of 243918 is about 62.4809968894.

The spelling of 243918 in words is "two hundred forty-three thousand, nine hundred eighteen".