13687439 has 2 divisors, whose sum is σ = 13687440. Its totient is φ = 13687438.

The previous prime is 13687423. The next prime is 13687463. The reversal of 13687439 is 93478631.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13687439 - 2⁴ = 13687423 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 13687396 and 13687405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13680439) 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, 6843719 + 6843720.

It is an arithmetic number, because the mean of its divisors is an integer number (6843720).

Almost surely, 2^13687439 is an apocalyptic number.

13687439 is a deficient number, since it is larger than the sum of its proper divisors (1).

13687439 is an equidigital number, since it uses as much as digits as its factorization.

13687439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 41.

The square root of 13687439 is about 3699.6539027320. The cubic root of 13687439 is about 239.2070997751.

The spelling of 13687439 in words is "thirteen million, six hundred eighty-seven thousand, four hundred thirty-nine".