243966 has 16 divisors (see below), whose sum is σ = 495504. Its totient is φ = 80064.

The previous prime is 243953. The next prime is 243973. The reversal of 243966 is 669342.

243966 is nontrivially palindromic in base 13.

It is a d-powerful number, because it can be written as 2⁹ + 4⁸ + 9³ + 3¹¹ + 6 + 6² .

It is a Curzon number.

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 243966.

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 7 ways as a sum of consecutive naturals, for example, 160 + ... + 716.

It is an arithmetic number, because the mean of its divisors is an integer number (30969).

2²⁴³⁹⁶⁶ is an apocalyptic number.

243966 is an abundant number, since it is smaller than the sum of its proper divisors (251538).

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

243966 is a wasteful number, since it uses less digits than its factorization.

243966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635.

The product of its digits is 7776, while the sum is 30.

The square root of 243966 is about 493.9291447161. The cubic root of 243966 is about 62.4850951125.

The spelling of 243966 in words is "two hundred forty-three thousand, nine hundred sixty-six".