7227218 has 4 divisors (see below), whose sum is σ = 10840830. Its totient is φ = 3613608.

The previous prime is 7227211. The next prime is 7227229. The reversal of 7227218 is 8127227.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5841889 + 1385329 = 2417^2 + 1177^2 .

It is not an unprimeable number, because it can be changed into a prime (7227211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1806803 + ... + 1806806.

Almost surely, 2^7227218 is an apocalyptic number.

7227218 is a deficient number, since it is larger than the sum of its proper divisors (3613612).

7227218 is a wasteful number, since it uses less digits than its factorization.

7227218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3613611.

The product of its digits is 3136, while the sum is 29.

The square root of 7227218 is about 2688.3485637097. The cubic root of 7227218 is about 193.3408921605.

Subtracting 7227218 from its reverse (8127227), we obtain a palindrome (900009).

The spelling of 7227218 in words is "seven million, two hundred twenty-seven thousand, two hundred eighteen".