12811218 has 16 divisors (see below), whose sum is σ = 29282880. Its totient is φ = 3660336.

The previous prime is 12811189. The next prime is 12811223. The reversal of 12811218 is 81211821.

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, 152473 + ... + 152556.

It is an arithmetic number, because the mean of its divisors is an integer number (1830180).

Almost surely, 2^12811218 is an apocalyptic number.

12811218 is an abundant number, since it is smaller than the sum of its proper divisors (16471662).

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

12811218 is a wasteful number, since it uses less digits than its factorization.

12811218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305041.

The product of its digits is 256, while the sum is 24.

The square root of 12811218 is about 3579.2761838115. The cubic root of 12811218 is about 233.9897358344.

The spelling of 12811218 in words is "twelve million, eight hundred eleven thousand, two hundred eighteen".