243686 has 4 divisors (see below), whose sum is σ = 365532. Its totient is φ = 121842.

The previous prime is 243673. The next prime is 243701. The reversal of 243686 is 686342.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 243686.

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 as a sum of consecutive naturals, namely, 60920 + ... + 60923.

It is an arithmetic number, because the mean of its divisors is an integer number (91383).

2²⁴³⁶⁸⁶ is an apocalyptic number.

243686 is a deficient number, since it is larger than the sum of its proper divisors (121846).

243686 is a wasteful number, since it uses less digits than its factorization.

243686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121845.

The product of its digits is 6912, while the sum is 29.

The square root of 243686 is about 493.6456218787. The cubic root of 243686 is about 62.4611812280.

It can be divided in two parts, 243 and 686, that added together give a palindrome (929).

The spelling of 243686 in words is "two hundred forty-three thousand, six hundred eighty-six".