243306 has 24 divisors (see below), whose sum is σ = 602784. Its totient is φ = 69480.

The previous prime is 243301. The next prime is 243311. The reversal of 243306 is 603342.

It is an interprime number because it is at equal distance from previous prime (243301) and next prime (243311).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (243301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 840 + ... + 1091.

It is an arithmetic number, because the mean of its divisors is an integer number (25116).

2²⁴³³⁰⁶ is an apocalyptic number.

243306 is an abundant number, since it is smaller than the sum of its proper divisors (359478).

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

243306 is a wasteful number, since it uses less digits than its factorization.

243306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1946 (or 1943 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 243306 is about 493.2605802210. The cubic root of 243306 is about 62.4286973525.

Adding to 243306 its reverse (603342), we get a palindrome (846648).

It can be divided in two parts, 24330 and 6, that added together give a square (24336 = 156²).

The spelling of 243306 in words is "two hundred forty-three thousand, three hundred six".