12656138 has 16 divisors (see below), whose sum is σ = 20770560. Its totient is φ = 5736000.

The previous prime is 12656129. The next prime is 12656159. The reversal of 12656138 is 83165621.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9938 + ... + 11138.

It is an arithmetic number, because the mean of its divisors is an integer number (1298160).

Almost surely, 2^12656138 is an apocalyptic number.

12656138 is a deficient number, since it is larger than the sum of its proper divisors (8114422).

12656138 is a wasteful number, since it uses less digits than its factorization.

12656138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1693.

The product of its digits is 8640, while the sum is 32.

The square root of 12656138 is about 3557.5466265391. The cubic root of 12656138 is about 233.0417505173.

It can be divided in two parts, 1265613 and 8, that added together give a palindrome (1265621).

The spelling of 12656138 in words is "twelve million, six hundred fifty-six thousand, one hundred thirty-eight".