13638671 has 4 divisors (see below), whose sum is σ = 14109000. Its totient is φ = 13168344.

The previous prime is 13638661. The next prime is 13638679. The reversal of 13638671 is 17683631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17683631 = 7 ⋅2526233.

It is a cyclic number.

It is not a de Polignac number, because 13638671 - 2¹⁸ = 13376527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13638679) 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, 235121 + ... + 235178.

It is an arithmetic number, because the mean of its divisors is an integer number (3527250).

Almost surely, 2^13638671 is an apocalyptic number.

13638671 is a deficient number, since it is larger than the sum of its proper divisors (470329).

13638671 is an equidigital number, since it uses as much as digits as its factorization.

13638671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470328.

The product of its digits is 18144, while the sum is 35.

The square root of 13638671 is about 3693.0571346785. The cubic root of 13638671 is about 238.9226654082.

The spelling of 13638671 in words is "thirteen million, six hundred thirty-eight thousand, six hundred seventy-one".