243866 has 8 divisors (see below), whose sum is σ = 418080. Its totient is φ = 104508.

The previous prime is 243863. The next prime is 243871. The reversal of 243866 is 668342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 243866.

It is not an unprimeable number, because it can be changed into a prime (243863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8696 + ... + 8723.

It is an arithmetic number, because the mean of its divisors is an integer number (52260).

2²⁴³⁸⁶⁶ is an apocalyptic number.

243866 is a deficient number, since it is larger than the sum of its proper divisors (174214).

243866 is a wasteful number, since it uses less digits than its factorization.

243866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17428.

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

The square root of 243866 is about 493.8279052464. The cubic root of 243866 is about 62.4765565409.

The spelling of 243866 in words is "two hundred forty-three thousand, eight hundred sixty-six".