243240223 has 4 divisors (see below), whose sum is σ = 256042360. Its totient is φ = 230438088.

The previous prime is 243240191. The next prime is 243240227. The reversal of 243240223 is 322042342.

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

It is a cyclic number.

It is not a de Polignac number, because 243240223 - 2⁵ = 243240191 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243240194 and 243240203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243240227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6401040 + ... + 6401077.

It is an arithmetic number, because the mean of its divisors is an integer number (64010590).

Almost surely, 2^243240223 is an apocalyptic number.

243240223 is a deficient number, since it is larger than the sum of its proper divisors (12802137).

243240223 is a wasteful number, since it uses less digits than its factorization.

243240223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12802136.

The product of its (nonzero) digits is 2304, while the sum is 22.

The square root of 243240223 is about 15596.1605211026. The cubic root of 243240223 is about 624.2307104583.

Adding to 243240223 its reverse (322042342), we get a palindrome (565282565).

The spelling of 243240223 in words is "two hundred forty-three million, two hundred forty thousand, two hundred twenty-three".