18

This number is a composite.

Just showing those entries submitted by 'Silva': (Click here to show all)

+ The sum of digits, digital product, and reversal of 18 are perfect powers of its prime divisors. [Silva]

+ 18 equals the product of its prime divisors plus the product of their factorials. [Silva]

(There is one curio for this number that has not yet been approved by an editor.)

Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell