12539939 has 2 divisors, whose sum is σ = 12539940. Its totient is φ = 12539938.

The previous prime is 12539909. The next prime is 12539951. The reversal of 12539939 is 93993521.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12539939 - 2¹² = 12535843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12539896 and 12539905.

It is not a weakly prime, because it can be changed into another prime (12539909) 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 as a sum of consecutive naturals, namely, 6269969 + 6269970.

It is an arithmetic number, because the mean of its divisors is an integer number (6269970).

Almost surely, 2^12539939 is an apocalyptic number.

12539939 is a deficient number, since it is larger than the sum of its proper divisors (1).

12539939 is an equidigital number, since it uses as much as digits as its factorization.

12539939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 65610, while the sum is 41.

The square root of 12539939 is about 3541.1776289816. The cubic root of 12539939 is about 232.3263527854.

The spelling of 12539939 in words is "twelve million, five hundred thirty-nine thousand, nine hundred thirty-nine".