13887891 has 6 divisors (see below), whose sum is σ = 20060300. Its totient is φ = 9258588.

The previous prime is 13887871. The next prime is 13887893. The reversal of 13887891 is 19878831.

13887891 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13887891 - 2⁵ = 13887859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13887893) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 771541 + ... + 771558.

Almost surely, 2^13887891 is an apocalyptic number.

13887891 is a deficient number, since it is larger than the sum of its proper divisors (6172409).

13887891 is a wasteful number, since it uses less digits than its factorization.

13887891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543105 (or 1543102 counting only the distinct ones).

The product of its digits is 96768, while the sum is 45.

The square root of 13887891 is about 3726.6460792514. The cubic root of 13887891 is about 240.3691714274.

The spelling of 13887891 in words is "thirteen million, eight hundred eighty-seven thousand, eight hundred ninety-one".