12222440 has 32 divisors (see below), whose sum is σ = 27972000. Its totient is φ = 4805184.

The previous prime is 12222433. The next prime is 12222461. The reversal of 12222440 is 4422221.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230 + ... + 4949.

It is an arithmetic number, because the mean of its divisors is an integer number (874125).

Almost surely, 2^12222440 is an apocalyptic number.

12222440 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 12222440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13986000).

12222440 is an abundant number, since it is smaller than the sum of its proper divisors (15749560).

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

12222440 is a wasteful number, since it uses less digits than its factorization.

12222440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5249 (or 5245 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 12222440 is about 3496.0606402063. The cubic root of 12222440 is about 230.3488091164.

Adding to 12222440 its reverse (4422221), we get a palindrome (16644661).

The spelling of 12222440 in words is "twelve million, two hundred twenty-two thousand, four hundred forty".