7222222 has 8 divisors (see below), whose sum is σ = 12380976. Its totient is φ = 3095232.

The previous prime is 7222219. The next prime is 7222279. The reversal of 7222222 is 2222227.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a nude number because it is divisible by every one of its digits.

7222222 is a modest number, since divided by 2222 gives 722 as remainder.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 7222222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257923 + ... + 257950.

It is an arithmetic number, because the mean of its divisors is an integer number (1547622).

Almost surely, 2^7222222 is an apocalyptic number.

7222222 is a deficient number, since it is larger than the sum of its proper divisors (5158754).

7222222 is a wasteful number, since it uses less digits than its factorization.

7222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515882.

The product of its digits is 448, while the sum is 19.

The square root of 7222222 is about 2687.4192080879. The cubic root of 7222222 is about 193.2963312724.

Adding to 7222222 its reverse (2222227), we get a palindrome (9444449).

The spelling of 7222222 in words is "seven million, two hundred twenty-two thousand, two hundred twenty-two".