12811918 has 16 divisors (see below), whose sum is σ = 22431744. Its totient is φ = 5373720.

The previous prime is 12811907. The next prime is 12811927. The reversal of 12811918 is 81911821.

It is a self number, because there is not a number n which added to its sum of digits gives 12811918.

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, 9078 + ... + 10393.

It is an arithmetic number, because the mean of its divisors is an integer number (1401984).

Almost surely, 2^12811918 is an apocalyptic number.

12811918 is a deficient number, since it is larger than the sum of its proper divisors (9619826).

12811918 is a wasteful number, since it uses less digits than its factorization.

12811918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19527.

The product of its digits is 1152, while the sum is 31.

The square root of 12811918 is about 3579.3739676094. The cubic root of 12811918 is about 233.9939974597.

The spelling of 12811918 in words is "twelve million, eight hundred eleven thousand, nine hundred eighteen".