13187687 has 4 divisors (see below), whose sum is σ = 13220976. Its totient is φ = 13154400.

The previous prime is 13187659. The next prime is 13187701. The reversal of 13187687 is 78678131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13187687 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 (13187987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16043 + ... + 16844.

It is an arithmetic number, because the mean of its divisors is an integer number (3305244).

Almost surely, 2^13187687 is an apocalyptic number.

13187687 is a deficient number, since it is larger than the sum of its proper divisors (33289).

13187687 is an equidigital number, since it uses as much as digits as its factorization.

13187687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33288.

The product of its digits is 56448, while the sum is 41.

The square root of 13187687 is about 3631.4855087140. The cubic root of 13187687 is about 236.2596431401.

The spelling of 13187687 in words is "thirteen million, one hundred eighty-seven thousand, six hundred eighty-seven".