12686172 has 12 divisors (see below), whose sum is σ = 29601096. Its totient is φ = 4228720.

The previous prime is 12686147. The next prime is 12686173. The reversal of 12686172 is 27168621.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12686173) 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 3 ways as a sum of consecutive naturals, for example, 528579 + ... + 528602.

It is an arithmetic number, because the mean of its divisors is an integer number (2466758).

Almost surely, 2^12686172 is an apocalyptic number.

12686172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12686172 is an abundant number, since it is smaller than the sum of its proper divisors (16914924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12686172 is a wasteful number, since it uses less digits than its factorization.

12686172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057188 (or 1057186 counting only the distinct ones).

The product of its digits is 8064, while the sum is 33.

The square root of 12686172 is about 3561.7652926604. The cubic root of 12686172 is about 233.2259469573.

The spelling of 12686172 in words is "twelve million, six hundred eighty-six thousand, one hundred seventy-two".