12809918 has 16 divisors (see below), whose sum is σ = 21529584. Its totient is φ = 5664960.

The previous prime is 12809879. The next prime is 12809921. The reversal of 12809918 is 81990821.

It is a congruent 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, 7055 + ... + 8682.

It is an arithmetic number, because the mean of its divisors is an integer number (1345599).

Almost surely, 2^12809918 is an apocalyptic number.

12809918 is a deficient number, since it is larger than the sum of its proper divisors (8719666).

12809918 is a wasteful number, since it uses less digits than its factorization.

12809918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15787.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 12809918 is about 3579.0945782418. The cubic root of 12809918 is about 233.9818209755.

The spelling of 12809918 in words is "twelve million, eight hundred nine thousand, nine hundred eighteen".