7223220 has 36 divisors (see below), whose sum is σ = 21910980. Its totient is φ = 1926144.

The previous prime is 7223201. The next prime is 7223221. The reversal of 7223220 is 223227.

It can be written as a sum of positive squares in 2 ways, for example, as 933156 + 6290064 = 966^2 + 2508^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a d-powerful number, because it can be written as 7⁸ + 2¹⁴ + 2¹⁷ + 3⁵ + 2¹⁸ + 2²⁰ + 0 .

It is a junction number, because it is equal to n+sod(n) for n = 7223193 and 7223202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7223221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19885 + ... + 20244.

Almost surely, 2^7223220 is an apocalyptic number.

It is an amenable number.

7223220 is an abundant number, since it is smaller than the sum of its proper divisors (14687760).

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

7223220 is a wasteful number, since it uses less digits than its factorization.

7223220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40144 (or 40139 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 7223220 is about 2687.6048816744. The cubic root of 7223220 is about 193.3052343890.

Adding to 7223220 its reverse (223227), we get a palindrome (7446447).

The spelling of 7223220 in words is "seven million, two hundred twenty-three thousand, two hundred twenty".