243204123 has 16 divisors (see below), whose sum is σ = 344865920. Its totient is φ = 152015616.

The previous prime is 243204119. The next prime is 243204151. The reversal of 243204123 is 321402342.

243204123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 243204123 - 2² = 243204119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243204123.

It is not an unprimeable number, because it can be changed into a prime (243204103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16465 + ... + 27522.

It is an arithmetic number, because the mean of its divisors is an integer number (21554120).

Almost surely, 2^243204123 is an apocalyptic number.

243204123 is a deficient number, since it is larger than the sum of its proper divisors (101661797).

243204123 is a wasteful number, since it uses less digits than its factorization.

243204123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44106.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 243204123 is about 15595.0031420324. The cubic root of 243204123 is about 624.1998276225.

Adding to 243204123 its reverse (321402342), we get a palindrome (564606465).

The spelling of 243204123 in words is "two hundred forty-three million, two hundred four thousand, one hundred twenty-three".