123443540023 has 4 divisors (see below), whose sum is σ = 123444993880. Its totient is φ = 123442086168.

The previous prime is 123443540021. The next prime is 123443540027. The reversal of 123443540023 is 320045344321.

It is a happy number.

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 123443540023 - 2¹ = 123443540021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123443540021) 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, 591108 + ... + 772201.

It is an arithmetic number, because the mean of its divisors is an integer number (30861248470).

Almost surely, 2^123443540023 is an apocalyptic number.

123443540023 is a deficient number, since it is larger than the sum of its proper divisors (1453857).

123443540023 is an equidigital number, since it uses as much as digits as its factorization.

123443540023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453856.

The product of its (nonzero) digits is 34560, while the sum is 31.

Adding to 123443540023 its reverse (320045344321), we get a palindrome (443488884344).

The spelling of 123443540023 in words is "one hundred twenty-three billion, four hundred forty-three million, five hundred forty thousand, twenty-three".