13887521 has 8 divisors (see below), whose sum is σ = 14740704. Its totient is φ = 13038400.

The previous prime is 13887493. The next prime is 13887539. The reversal of 13887521 is 12578831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13887521 - 2¹⁰ = 13886497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13887541) 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 7 ways as a sum of consecutive naturals, for example, 8846 + ... + 10296.

It is an arithmetic number, because the mean of its divisors is an integer number (1842588).

Almost surely, 2^13887521 is an apocalyptic number.

It is an amenable number.

13887521 is a deficient number, since it is larger than the sum of its proper divisors (853183).

13887521 is a wasteful number, since it uses less digits than its factorization.

13887521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2031.

The product of its digits is 13440, while the sum is 35.

The square root of 13887521 is about 3726.5964364283. The cubic root of 13887521 is about 240.3670367768.

The spelling of 13887521 in words is "thirteen million, eight hundred eighty-seven thousand, five hundred twenty-one".