13888891 has 4 divisors (see below), whose sum is σ = 13905112. Its totient is φ = 13872672.

The previous prime is 13888879. The next prime is 13888933. The reversal of 13888891 is 19888831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19888831 = 367 ⋅54193.

It is a cyclic number.

It is not a de Polignac number, because 13888891 - 2⁹ = 13888379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13888841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6750 + ... + 8563.

It is an arithmetic number, because the mean of its divisors is an integer number (3476278).

Almost surely, 2^13888891 is an apocalyptic number.

13888891 is a deficient number, since it is larger than the sum of its proper divisors (16221).

13888891 is an equidigital number, since it uses as much as digits as its factorization.

13888891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16220.

The product of its digits is 110592, while the sum is 46.

The square root of 13888891 is about 3726.7802457349. The cubic root of 13888891 is about 240.3749405636.

The spelling of 13888891 in words is "thirteen million, eight hundred eighty-eight thousand, eight hundred ninety-one".