123123423 has 4 divisors (see below), whose sum is σ = 164164568. Its totient is φ = 82082280.

The previous prime is 123123397. The next prime is 123123461. The reversal of 123123423 is 324321321.

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

It is not a de Polignac number, because 123123423 - 2⁵ = 123123391 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 123123423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123123493) 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, 20520568 + ... + 20520573.

It is an arithmetic number, because the mean of its divisors is an integer number (41041142).

Almost surely, 2^123123423 is an apocalyptic number.

123123423 is a deficient number, since it is larger than the sum of its proper divisors (41041145).

123123423 is an equidigital number, since it uses as much as digits as its factorization.

123123423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41041144.

The product of its digits is 864, while the sum is 21.

The square root of 123123423 is about 11096.0994498067. The cubic root of 123123423 is about 497.4852708113.

Adding to 123123423 its reverse (324321321), we get a palindrome (447444744).

The spelling of 123123423 in words is "one hundred twenty-three million, one hundred twenty-three thousand, four hundred twenty-three".