12539923 has 4 divisors (see below), whose sum is σ = 13679928. Its totient is φ = 11399920.

The previous prime is 12539909. The next prime is 12539939. The reversal of 12539923 is 32993521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32993521 = 11 ⋅2999411.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12539923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12539993) 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, 569986 + ... + 570007.

It is an arithmetic number, because the mean of its divisors is an integer number (3419982).

Almost surely, 2^12539923 is an apocalyptic number.

12539923 is a deficient number, since it is larger than the sum of its proper divisors (1140005).

12539923 is a wasteful number, since it uses less digits than its factorization.

12539923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140004.

The product of its digits is 14580, while the sum is 34.

The square root of 12539923 is about 3541.1753698454. The cubic root of 12539923 is about 232.3262539752.

It can be divided in two parts, 12 and 539923, that added together give a palindrome (539935).

The spelling of 12539923 in words is "twelve million, five hundred thirty-nine thousand, nine hundred twenty-three".