123043440243 has 4 divisors (see below), whose sum is σ = 164057920328. Its totient is φ = 82028960160.

The previous prime is 123043440229. The next prime is 123043440257. The reversal of 123043440243 is 342044340321.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (123043440229) and next prime (123043440257).

It is not a de Polignac number, because 123043440243 - 2⁵ = 123043440211 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 123043440243.

It is not an unprimeable number, because it can be changed into a prime (123043440643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20507240038 + ... + 20507240043.

It is an arithmetic number, because the mean of its divisors is an integer number (41014480082).

Almost surely, 2^123043440243 is an apocalyptic number.

123043440243 is a deficient number, since it is larger than the sum of its proper divisors (41014480085).

123043440243 is an equidigital number, since it uses as much as digits as its factorization.

123043440243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41014480084.

The product of its (nonzero) digits is 27648, while the sum is 30.

Adding to 123043440243 its reverse (342044340321), we get a palindrome (465087780564).

The spelling of 123043440243 in words is "one hundred twenty-three billion, forty-three million, four hundred forty thousand, two hundred forty-three".