123423 has 4 divisors (see below), whose sum is σ = 164568. Its totient is φ = 82280.

The previous prime is 123419. The next prime is 123427. The reversal of 123423 is 324321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 324321 = 3 ⋅108107.

It is an interprime number because it is at equal distance from previous prime (123419) and next prime (123427).

It is a cyclic number.

It is not a de Polignac number, because 123423 - 2² = 123419 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20568 + ... + 20573.

It is an arithmetic number, because the mean of its divisors is an integer number (41142).

2¹²³⁴²³ is an apocalyptic number.

123423 is a deficient number, since it is larger than the sum of its proper divisors (41145).

123423 is an equidigital number, since it uses as much as digits as its factorization.

123423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41144.

The product of its digits is 144, while the sum is 15.

The square root of 123423 is about 351.3160969839. The cubic root of 123423 is about 49.7888428417.

Adding to 123423 its reverse (324321), we get a palindrome (447744).

It can be divided in two parts, 1234 and 23, that multiplied together give a palindrome (28382).

The spelling of 123423 in words is "one hundred twenty-three thousand, four hundred twenty-three", and thus it is an iban number.