123423605 has 4 divisors (see below), whose sum is σ = 148108332. Its totient is φ = 98738880.

The previous prime is 123423593. The next prime is 123423607. The reversal of 123423605 is 506324321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 506324321 = 107 ⋅4732003.

It can be written as a sum of positive squares in 2 ways, for example, as 63856081 + 59567524 = 7991^2 + 7718^2 .

It is not a de Polignac number, because 123423605 - 2⁶ = 123423541 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 (123423607) 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, 12342356 + ... + 12342365.

It is an arithmetic number, because the mean of its divisors is an integer number (37027083).

Almost surely, 2^123423605 is an apocalyptic number.

It is an amenable number.

123423605 is a deficient number, since it is larger than the sum of its proper divisors (24684727).

123423605 is an equidigital number, since it uses as much as digits as its factorization.

123423605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24684726.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 123423605 is about 11109.6176801904. The cubic root of 123423605 is about 497.8892419396.

Adding to 123423605 its reverse (506324321), we get a palindrome (629747926).

The spelling of 123423605 in words is "one hundred twenty-three million, four hundred twenty-three thousand, six hundred five".