12666918 has 32 divisors (see below), whose sum is σ = 27775872. Its totient is φ = 3819200.

The previous prime is 12666911. The next prime is 12666919. The reversal of 12666918 is 81966621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12666911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18205 + ... + 18887.

It is an arithmetic number, because the mean of its divisors is an integer number (867996).

Almost surely, 2^12666918 is an apocalyptic number.

12666918 is an abundant number, since it is smaller than the sum of its proper divisors (15108954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12666918 is a wasteful number, since it uses less digits than its factorization.

12666918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980.

The product of its digits is 31104, while the sum is 39.

The square root of 12666918 is about 3559.0613931204. The cubic root of 12666918 is about 233.1078970028.

The spelling of 12666918 in words is "twelve million, six hundred sixty-six thousand, nine hundred eighteen".