7209220 has 12 divisors (see below), whose sum is σ = 15139404. Its totient is φ = 2883680.

The previous prime is 7209211. The next prime is 7209229. The reversal of 7209220 is 229027.

It is an interprime number because it is at equal distance from previous prime (7209211) and next prime (7209229).

It can be written as a sum of positive squares in 2 ways, for example, as 777924 + 6431296 = 882^2 + 2536^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7209191 and 7209200.

It is not an unprimeable number, because it can be changed into a prime (7209229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180211 + ... + 180250.

It is an arithmetic number, because the mean of its divisors is an integer number (1261617).

Almost surely, 2^7209220 is an apocalyptic number.

It is an amenable number.

7209220 is an abundant number, since it is smaller than the sum of its proper divisors (7930184).

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

7209220 is a wasteful number, since it uses less digits than its factorization.

7209220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360470 (or 360468 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 7209220 is about 2684.9990689011. Note that the first 3 decimals coincide. The cubic root of 7209220 is about 193.1802659496.

The spelling of 7209220 in words is "seven million, two hundred nine thousand, two hundred twenty".