13887539 has 2 divisors, whose sum is σ = 13887540. Its totient is φ = 13887538.

The previous prime is 13887493. The next prime is 13887541. The reversal of 13887539 is 93578831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13887539 is a prime.

Together with 13887541, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13887539.

It is not a weakly prime, because it can be changed into another prime (13887569) 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, 6943769 + 6943770.

It is an arithmetic number, because the mean of its divisors is an integer number (6943770).

Almost surely, 2^13887539 is an apocalyptic number.

13887539 is a deficient number, since it is larger than the sum of its proper divisors (1).

13887539 is an equidigital number, since it uses as much as digits as its factorization.

13887539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 44.

The square root of 13887539 is about 3726.5988514998. The cubic root of 13887539 is about 240.3671406256.

The spelling of 13887539 in words is "thirteen million, eight hundred eighty-seven thousand, five hundred thirty-nine".