243684 has 36 divisors (see below), whose sum is σ = 704704. Its totient is φ = 69552.

The previous prime is 243673. The next prime is 243701. The reversal of 243684 is 486342.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

243684 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 11 ways as a sum of consecutive naturals, for example, 232 + ... + 735.

2²⁴³⁶⁸⁴ is an apocalyptic number.

It is an amenable number.

243684 is an abundant number, since it is smaller than the sum of its proper divisors (461020).

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

243684 is a wasteful number, since it uses less digits than its factorization.

243684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984 (or 979 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 243684 is about 493.6435961298. The cubic root of 243684 is about 62.4610103486.

The spelling of 243684 in words is "two hundred forty-three thousand, six hundred eighty-four".