12686644 has 6 divisors (see below), whose sum is σ = 22201634. Its totient is φ = 6343320.

The previous prime is 12686629. The next prime is 12686647. The reversal of 12686644 is 44668621.

It can be written as a sum of positive squares in only one way, i.e., 10692900 + 1993744 = 3270^2 + 1412^2 .

It is a super-3 number, since 3×12686644³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12686647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1585827 + ... + 1585834.

Almost surely, 2^12686644 is an apocalyptic number.

It is an amenable number.

12686644 is a deficient number, since it is larger than the sum of its proper divisors (9514990).

12686644 is a wasteful number, since it uses less digits than its factorization.

12686644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3171665 (or 3171663 counting only the distinct ones).

The product of its digits is 55296, while the sum is 37.

The square root of 12686644 is about 3561.8315513230. The cubic root of 12686644 is about 233.2288393791.

The spelling of 12686644 in words is "twelve million, six hundred eighty-six thousand, six hundred forty-four".