7243220 has 12 divisors (see below), whose sum is σ = 15210804. Its totient is φ = 2897280.

The previous prime is 7243213. The next prime is 7243259. The reversal of 7243220 is 223427.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 781456 + 6461764 = 884^2 + 2542^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 362161 = 7243220 / (7 + 2 + 4 + 3 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 7243192 and 7243201.

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, 181061 + ... + 181100.

It is an arithmetic number, because the mean of its divisors is an integer number (1267567).

Almost surely, 2^7243220 is an apocalyptic number.

It is an amenable number.

7243220 is an abundant number, since it is smaller than the sum of its proper divisors (7967584).

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

7243220 is a wasteful number, since it uses less digits than its factorization.

7243220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362170 (or 362168 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 7243220 is about 2691.3230946878. The cubic root of 7243220 is about 193.4834809304.

Adding to 7243220 its reverse (223427), we get a palindrome (7466647).

The spelling of 7243220 in words is "seven million, two hundred forty-three thousand, two hundred twenty".