12218720 has 24 divisors (see below), whose sum is σ = 28867104. Its totient is φ = 4887424.

The previous prime is 12218711. The next prime is 12218741. The reversal of 12218720 is 2781221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38024 + ... + 38343.

It is an arithmetic number, because the mean of its divisors is an integer number (1202796).

Almost surely, 2^12218720 is an apocalyptic number.

12218720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12218720 is an abundant number, since it is smaller than the sum of its proper divisors (16648384).

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

12218720 is an equidigital number, since it uses as much as digits as its factorization.

12218720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76382 (or 76374 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 12218720 is about 3495.5285723335. The cubic root of 12218720 is about 230.3254372278.

Adding to 12218720 its reverse (2781221), we get a palindrome (14999941).

The spelling of 12218720 in words is "twelve million, two hundred eighteen thousand, seven hundred twenty".