7218

7218 is a natural number in the decimal system, positioned between 7217 and 7219. It is even and composite.

Its prime factorization is 2 × 3^2 × 401. Therefore it is divisible by 2, 3, 6, 9, 18, and 401, among others.

The sum of its decimal digits is 18, so the number is divisible by 9 (and by 3). In fact 7218 = 9 × 802. The digital root is 9.

In other numeral systems, 7218 is 1110000110010 in binary, 1C32 in hexadecimal, and 16062 in octal.

There is no widely reported mathematical or historical significance attached to 7218 beyond its status as a four-digit composite number. When used in practice, it may serve as an identifier, code, or index, as is common for large integers.