12805218 has 24 divisors (see below), whose sum is σ = 27813708. Its totient is φ = 4257792.

The previous prime is 12805217. The next prime is 12805229. The reversal of 12805218 is 81250821.

It can be written as a sum of positive squares in 2 ways, for example, as 12510369 + 294849 = 3537^2 + 543^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12805191 and 12805200.

It is not an unprimeable number, because it can be changed into a prime (12805217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10530 + ... + 11682.

Almost surely, 2^12805218 is an apocalyptic number.

12805218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12805218 is an abundant number, since it is smaller than the sum of its proper divisors (15008490).

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

12805218 is a wasteful number, since it uses less digits than its factorization.

12805218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1778 (or 1775 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 12805218 is about 3578.4379273644. The cubic root of 12805218 is about 233.9532012482.

The spelling of 12805218 in words is "twelve million, eight hundred five thousand, two hundred eighteen".