12817818 has 96 divisors (see below), whose sum is σ = 33364800. Its totient is φ = 3615840.

The previous prime is 12817811. The next prime is 12817823. The reversal of 12817818 is 81871821.

12817818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×12817818² = 328592916562248, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12817811) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 413463 + ... + 413493.

It is an arithmetic number, because the mean of its divisors is an integer number (347550).

Almost surely, 2^12817818 is an apocalyptic number.

12817818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12817818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16682400).

12817818 is an abundant number, since it is smaller than the sum of its proper divisors (20546982).

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

12817818 is a wasteful number, since it uses less digits than its factorization.

12817818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105 (or 68 counting only the distinct ones).

The product of its digits is 7168, while the sum is 36.

The square root of 12817818 is about 3580.1980392151. The cubic root of 12817818 is about 234.0299107065.

The spelling of 12817818 in words is "twelve million, eight hundred seventeen thousand, eight hundred eighteen".