12144220 has 24 divisors (see below), whose sum is σ = 27821808. Its totient is φ = 4416000.

The previous prime is 12144217. The next prime is 12144227. The reversal of 12144220 is 2244121.

It is a junction number, because it is equal to n+sod(n) for n = 12144194 and 12144203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12144227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27381 + ... + 27820.

It is an arithmetic number, because the mean of its divisors is an integer number (1159242).

Almost surely, 2^12144220 is an apocalyptic number.

12144220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12144220 is an abundant number, since it is smaller than the sum of its proper divisors (15677588).

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

12144220 is a wasteful number, since it uses less digits than its factorization.

12144220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55221 (or 55219 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 12144220 is about 3484.8558076339. The cubic root of 12144220 is about 229.8563690508.

Adding to 12144220 its reverse (2244121), we get a palindrome (14388341).

Subtracting from 12144220 its reverse (2244121), we obtain a palindrome (9900099).

The spelling of 12144220 in words is "twelve million, one hundred forty-four thousand, two hundred twenty".