12643687 has 4 divisors (see below), whose sum is σ = 14449936. Its totient is φ = 10837440.

The previous prime is 12643669. The next prime is 12643717. The reversal of 12643687 is 78634621.

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

It is a cyclic number.

It is not a de Polignac number, because 12643687 - 2¹¹ = 12641639 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 (12643187) 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, 903114 + ... + 903127.

It is an arithmetic number, because the mean of its divisors is an integer number (3612484).

Almost surely, 2^12643687 is an apocalyptic number.

12643687 is a deficient number, since it is larger than the sum of its proper divisors (1806249).

12643687 is an equidigital number, since it uses as much as digits as its factorization.

12643687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1806248.

The product of its digits is 48384, while the sum is 37.

The square root of 12643687 is about 3555.7962540056. The cubic root of 12643687 is about 232.9653039509.

The spelling of 12643687 in words is "twelve million, six hundred forty-three thousand, six hundred eighty-seven".