243685 has 16 divisors (see below), whose sum is σ = 330624. Its totient is φ = 171072.

The previous prime is 243673. The next prime is 243701. The reversal of 243685 is 586342.

It is a cyclic number.

It is not a de Polignac number, because 243685 - 2¹³ = 235493 is a prime.

It is a Duffinian number.

243685 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1414 + ... + 1576.

It is an arithmetic number, because the mean of its divisors is an integer number (20664).

2²⁴³⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

243685 is a deficient number, since it is larger than the sum of its proper divisors (86939).

243685 is a wasteful number, since it uses less digits than its factorization.

243685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204.

The product of its digits is 5760, while the sum is 28.

The square root of 243685 is about 493.6446090053. The cubic root of 243685 is about 62.4610957884.

The spelling of 243685 in words is "two hundred forty-three thousand, six hundred eighty-five".