2222640 has 200 divisors, whose sum is σ = 9002400. Its totient is φ = 508032.

The previous prime is 2222629. The next prime is 2222653. The reversal of 2222640 is 462222.

It is a happy number.

2222640 is a `hidden beast` number, since 2 + 2 + 22 + 640 = 666.

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

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 317517 + ... + 317523.

It is an arithmetic number, because the mean of its divisors is an integer number (45012).

2^2222640 is an apocalyptic number.

2222640 is a gapful number since it is divisible by the number (20) 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 2222640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4501200).

2222640 is an abundant number, since it is smaller than the sum of its proper divisors (6779760).

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

2222640 is an equidigital number, since it uses as much as digits as its factorization.

2222640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46 (or 17 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 2222640 is about 1490.8521053411. The cubic root of 2222640 is about 130.5037652501.

Adding to 2222640 its reverse (462222), we get a palindrome (2684862).

The spelling of 2222640 in words is "two million, two hundred twenty-two thousand, six hundred forty".