7222209 has 4 divisors (see below), whose sum is σ = 9629616. Its totient is φ = 4814804.

The previous prime is 7222199. The next prime is 7222219. The reversal of 7222209 is 9022227.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9022227 = 3 ⋅3007409.

It is an interprime number because it is at equal distance from previous prime (7222199) and next prime (7222219).

It is a cyclic number.

It is not a de Polignac number, because 7222209 - 2⁵ = 7222177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7222219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1203699 + ... + 1203704.

It is an arithmetic number, because the mean of its divisors is an integer number (2407404).

Almost surely, 2^7222209 is an apocalyptic number.

It is an amenable number.

7222209 is a deficient number, since it is larger than the sum of its proper divisors (2407407).

7222209 is a wasteful number, since it uses less digits than its factorization.

7222209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2407406.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 7222209 is about 2687.4167894095. The cubic root of 7222209 is about 193.2962152946.

The spelling of 7222209 in words is "seven million, two hundred twenty-two thousand, two hundred nine".