12809172 has 24 divisors (see below), whose sum is σ = 29947456. Its totient is φ = 4261248.

The previous prime is 12809149. The next prime is 12809191. The reversal of 12809172 is 27190821.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9228 + ... + 10524.

Almost surely, 2^12809172 is an apocalyptic number.

12809172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12809172 is an abundant number, since it is smaller than the sum of its proper divisors (17138284).

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

12809172 is a wasteful number, since it uses less digits than its factorization.

12809172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2127 (or 2125 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 12809172 is about 3578.9903604229. The cubic root of 12809172 is about 233.9772788224.

Adding to 12809172 its reverse (27190821), we get a palindrome (39999993).

The spelling of 12809172 in words is "twelve million, eight hundred nine thousand, one hundred seventy-two".