12688442 has 16 divisors (see below), whose sum is σ = 20564712. Its totient is φ = 5836800.

The previous prime is 12688441. The next prime is 12688451. The reversal of 12688442 is 24488621.

It can be written as a sum of positive squares in 4 ways, for example, as 11363641 + 1324801 = 3371^2 + 1151^2 .

It is not an unprimeable number, because it can be changed into a prime (12688441) 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 7 ways as a sum of consecutive naturals, for example, 9818 + ... + 11034.

Almost surely, 2^12688442 is an apocalyptic number.

12688442 is a deficient number, since it is larger than the sum of its proper divisors (7876270).

12688442 is a wasteful number, since it uses less digits than its factorization.

12688442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1633.

The product of its digits is 24576, while the sum is 35.

The square root of 12688442 is about 3562.0839406168. The cubic root of 12688442 is about 233.2398568882.

The spelling of 12688442 in words is "twelve million, six hundred eighty-eight thousand, four hundred forty-two".