12539905 has 32 divisors (see below), whose sum is σ = 18374400. Its totient is φ = 8024832.

The previous prime is 12539893. The next prime is 12539909. The reversal of 12539905 is 50993521.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12539905 - 2⁵ = 12539873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12539909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72399 + ... + 72571.

It is an arithmetic number, because the mean of its divisors is an integer number (574200).

Almost surely, 2^12539905 is an apocalyptic number.

It is an amenable number.

12539905 is a deficient number, since it is larger than the sum of its proper divisors (5834495).

12539905 is a wasteful number, since it uses less digits than its factorization.

12539905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313.

The product of its (nonzero) digits is 12150, while the sum is 34.

The square root of 12539905 is about 3541.1728283155. The cubic root of 12539905 is about 232.3261428136.

The spelling of 12539905 in words is "twelve million, five hundred thirty-nine thousand, nine hundred five".