12809216 has 44 divisors (see below), whose sum is σ = 29280288. Its totient is φ = 5486592.

The previous prime is 12809191. The next prime is 12809221. The reversal of 12809216 is 61290821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6275 + ... + 8061.

Almost surely, 2^12809216 is an apocalyptic number.

12809216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12809216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14640144).

12809216 is an abundant number, since it is smaller than the sum of its proper divisors (16471072).

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

12809216 is an equidigital number, since it uses as much as digits as its factorization.

12809216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1814 (or 1796 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 12809216 is about 3578.9965074026. The cubic root of 12809216 is about 233.9775467291.

The spelling of 12809216 in words is "twelve million, eight hundred nine thousand, two hundred sixteen".