12788646 has 32 divisors (see below), whose sum is σ = 27783168. Its totient is φ = 3900960.

The previous prime is 12788639. The next prime is 12788669. The reversal of 12788646 is 64688721.

It is a junction number, because it is equal to n+sod(n) for n = 12788598 and 12788607.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 9261 + ... + 10551.

It is an arithmetic number, because the mean of its divisors is an integer number (868224).

Almost surely, 2^12788646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12788646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13891584).

12788646 is an abundant number, since it is smaller than the sum of its proper divisors (14994522).

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

12788646 is a wasteful number, since it uses less digits than its factorization.

12788646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436.

The product of its digits is 129024, while the sum is 42.

The square root of 12788646 is about 3576.1216422264. The cubic root of 12788646 is about 233.8522333935.

The spelling of 12788646 in words is "twelve million, seven hundred eighty-eight thousand, six hundred forty-six".