12688445 has 16 divisors (see below), whose sum is σ = 18983808. Its totient is φ = 7909440.

The previous prime is 12688441. The next prime is 12688451. The reversal of 12688445 is 54488621.

It is a happy number.

12688445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12688445 - 2² = 12688441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12688399 and 12688408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12688441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16094 + ... + 16863.

It is an arithmetic number, because the mean of its divisors is an integer number (1186488).

Almost surely, 2^12688445 is an apocalyptic number.

It is an amenable number.

12688445 is a deficient number, since it is larger than the sum of its proper divisors (6295363).

12688445 is a wasteful number, since it uses less digits than its factorization.

12688445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32980.

The product of its digits is 61440, while the sum is 38.

The square root of 12688445 is about 3562.0843617186. The cubic root of 12688445 is about 233.2398752702.

The spelling of 12688445 in words is "twelve million, six hundred eighty-eight thousand, four hundred forty-five".