12687844 has 27 divisors (see below), whose sum is σ = 24219867. Its totient is φ = 5813184.

The previous prime is 12687841. The next prime is 12687847. The reversal of 12687844 is 44878621.

The square root of 12687844 is 3562.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (12687841) and next prime (12687847).

It can be written as a sum of positive squares in 4 ways, for example, as 1127844 + 11560000 = 1062^2 + 3400^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12687797 and 12687806.

It is not an unprimeable number, because it can be changed into a prime (12687841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 92544 + ... + 92680.

Almost surely, 2^12687844 is an apocalyptic number.

12687844 is the 3562-nd square number.

It is an amenable number.

12687844 is a deficient number, since it is larger than the sum of its proper divisors (11532023).

12687844 is a wasteful number, since it uses less digits than its factorization.

12687844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304 (or 152 counting only the distinct ones).

The product of its digits is 86016, while the sum is 40.

The cubic root of 12687844 is about 233.2361926709.

It can be divided in two parts, 12687 and 844, that added together give a palindrome (13531).

The spelling of 12687844 in words is "twelve million, six hundred eighty-seven thousand, eight hundred forty-four".