7218222 has 16 divisors (see below), whose sum is σ = 15748992. Its totient is φ = 2187320.

The previous prime is 7218221. The next prime is 7218227. The reversal of 7218222 is 2228127.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 7218192 and 7218201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7218221) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 54618 + ... + 54749.

It is an arithmetic number, because the mean of its divisors is an integer number (984312).

Almost surely, 2^7218222 is an apocalyptic number.

7218222 is an abundant number, since it is smaller than the sum of its proper divisors (8530770).

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

7218222 is a wasteful number, since it uses less digits than its factorization.

7218222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109383.

The product of its digits is 896, while the sum is 24.

The square root of 7218222 is about 2686.6748965962. The cubic root of 7218222 is about 193.2606392047.

The spelling of 7218222 in words is "seven million, two hundred eighteen thousand, two hundred twenty-two".