12218820 has 48 divisors (see below), whose sum is σ = 35054208. Its totient is φ = 3178240.

The previous prime is 12218783. The next prime is 12218821. The reversal of 12218820 is 2881221.

12218820 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (12218821) 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, 24 + ... + 4943.

It is an arithmetic number, because the mean of its divisors is an integer number (730296).

Almost surely, 2^12218820 is an apocalyptic number.

12218820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12218820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17527104).

12218820 is an abundant number, since it is smaller than the sum of its proper divisors (22835388).

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

12218820 is a wasteful number, since it uses less digits than its factorization.

12218820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5020 (or 5018 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 12218820 is about 3495.5428762926. The cubic root of 12218820 is about 230.3260655664.

The spelling of 12218820 in words is "twelve million, two hundred eighteen thousand, eight hundred twenty".