12423439 has 4 divisors (see below), whose sum is σ = 14198224. Its totient is φ = 10648656.

The previous prime is 12423409. The next prime is 12423457. The reversal of 12423439 is 93432421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93432421 = 43 ⋅2172847.

It is a cyclic number.

It is not a de Polignac number, because 12423439 - 2⁵ = 12423407 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 (12423409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 887382 + ... + 887395.

It is an arithmetic number, because the mean of its divisors is an integer number (3549556).

Almost surely, 2^12423439 is an apocalyptic number.

12423439 is a deficient number, since it is larger than the sum of its proper divisors (1774785).

12423439 is an equidigital number, since it uses as much as digits as its factorization.

12423439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774784.

The product of its digits is 5184, while the sum is 28.

The square root of 12423439 is about 3524.6899154394. The cubic root of 12423439 is about 231.6046514359.

The spelling of 12423439 in words is "twelve million, four hundred twenty-three thousand, four hundred thirty-nine".