12222720 has 108 divisors (see below), whose sum is σ = 42329196. Its totient is φ = 3256320.

The previous prime is 12222713. The next prime is 12222731. The reversal of 12222720 is 2722221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6230016 + 5992704 = 2496^2 + 2448^2 .

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 12222693 and 12222702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10990 + ... + 12050.

It is an arithmetic number, because the mean of its divisors is an integer number (391937).

Almost surely, 2^12222720 is an apocalyptic number.

12222720 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 12222720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21164598).

12222720 is an abundant number, since it is smaller than the sum of its proper divisors (30106476).

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

12222720 is a wasteful number, since it uses less digits than its factorization.

12222720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088 (or 1071 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 12222720 is about 3496.1006850490. The cubic root of 12222720 is about 230.3505680989.

Adding to 12222720 its reverse (2722221), we get a palindrome (14944941).

The spelling of 12222720 in words is "twelve million, two hundred twenty-two thousand, seven hundred twenty".