12809138 has 16 divisors (see below), whose sum is σ = 20321280. Its totient is φ = 6045600.

The previous prime is 12809131. The next prime is 12809149. The reversal of 12809138 is 83190821.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12809131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23 + ... + 5061.

It is an arithmetic number, because the mean of its divisors is an integer number (1270080).

Almost surely, 2^12809138 is an apocalyptic number.

12809138 is a deficient number, since it is larger than the sum of its proper divisors (7512142).

12809138 is a wasteful number, since it uses less digits than its factorization.

12809138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5113.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 12809138 is about 3578.9856104768. The cubic root of 12809138 is about 233.9770718032.

Adding to 12809138 its reverse (83190821), we get a palindrome (95999959).

The spelling of 12809138 in words is "twelve million, eight hundred nine thousand, one hundred thirty-eight".