243894 has 16 divisors (see below), whose sum is σ = 557568. Its totient is φ = 69672.

The previous prime is 243889. The next prime is 243911. The reversal of 243894 is 498342.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

243894 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, 2862 + ... + 2945.

It is an arithmetic number, because the mean of its divisors is an integer number (34848).

2²⁴³⁸⁹⁴ is an apocalyptic number.

243894 is an abundant number, since it is smaller than the sum of its proper divisors (313674).

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

243894 is a wasteful number, since it uses less digits than its factorization.

243894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5819.

The product of its digits is 6912, while the sum is 30.

The square root of 243894 is about 493.8562543899. The cubic root of 243894 is about 62.4789475762.

The spelling of 243894 in words is "two hundred forty-three thousand, eight hundred ninety-four".