7218224 has 20 divisors (see below), whose sum is σ = 15061536. Its totient is φ = 3331392.

The previous prime is 7218221. The next prime is 7218227. The reversal of 7218224 is 4228127.

It is an interprime number because it is at equal distance from previous prime (7218221) and next prime (7218227).

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 7218193 and 7218202.

It is not an unprimeable number, because it can be changed into a prime (7218221) 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, 17144 + ... + 17559.

Almost surely, 2^7218224 is an apocalyptic number.

It is an amenable number.

7218224 is an abundant number, since it is smaller than the sum of its proper divisors (7843312).

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

7218224 is a wasteful number, since it uses less digits than its factorization.

7218224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34724 (or 34718 counting only the distinct ones).

The product of its digits is 1792, while the sum is 26.

The square root of 7218224 is about 2686.6752688034. The cubic root of 7218224 is about 193.2606570540.

The spelling of 7218224 in words is "seven million, two hundred eighteen thousand, two hundred twenty-four".