12686144 has 14 divisors (see below), whose sum is σ = 25174194. Its totient is φ = 6343040.

The previous prime is 12686119. The next prime is 12686147. The reversal of 12686144 is 44168621.

It can be written as a sum of positive squares in only one way, i.e., 12673600 + 12544 = 3560^2 + 112^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 12686144.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12686147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99047 + ... + 99174.

Almost surely, 2^12686144 is an apocalyptic number.

It is an amenable number.

12686144 is a deficient number, since it is larger than the sum of its proper divisors (12488050).

12686144 is an equidigital number, since it uses as much as digits as its factorization.

12686144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198233 (or 198223 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 12686144 is about 3561.7613620230. The cubic root of 12686144 is about 233.2257753707.

The spelling of 12686144 in words is "twelve million, six hundred eighty-six thousand, one hundred forty-four".