243400223 has 4 divisors (see below), whose sum is σ = 265527528. Its totient is φ = 221272920.

The previous prime is 243400181. The next prime is 243400247. The reversal of 243400223 is 322004342.

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

It is not a de Polignac number, because 243400223 - 2⁸ = 243399967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243400195 and 243400204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243400123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11063636 + ... + 11063657.

It is an arithmetic number, because the mean of its divisors is an integer number (66381882).

Almost surely, 2^243400223 is an apocalyptic number.

243400223 is a deficient number, since it is larger than the sum of its proper divisors (22127305).

243400223 is a wasteful number, since it uses less digits than its factorization.

243400223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22127304.

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 243400223 is about 15601.2891454521. The cubic root of 243400223 is about 624.3675505215.

Adding to 243400223 its reverse (322004342), we get a palindrome (565404565).

The spelling of 243400223 in words is "two hundred forty-three million, four hundred thousand, two hundred twenty-three".