13638871 has 4 divisors (see below), whose sum is σ = 13647600. Its totient is φ = 13630144.

The previous prime is 13638817. The next prime is 13638881. The reversal of 13638871 is 17883631.

13638871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 17883631 = 53 ⋅337427.

It is a cyclic number.

It is not a de Polignac number, because 13638871 - 2¹⁷ = 13507799 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13638871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13638881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1306 + ... + 5383.

It is an arithmetic number, because the mean of its divisors is an integer number (3411900).

Almost surely, 2^13638871 is an apocalyptic number.

13638871 is a deficient number, since it is larger than the sum of its proper divisors (8729).

13638871 is an equidigital number, since it uses as much as digits as its factorization.

13638871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8728.

The product of its digits is 24192, while the sum is 37.

The square root of 13638871 is about 3693.0842124165. The cubic root of 13638871 is about 238.9238332712.

The spelling of 13638871 in words is "thirteen million, six hundred thirty-eight thousand, eight hundred seventy-one".