Number Gossip
(Enter a number and I'll tell you everything you wanted to know about it but were afraid to ask.)
Unique Properties of 192
- 192 is the smallest number that together with its double and triple contain every digit from 1-9 exactly once
Rare Properties of 192
The n-th compositorial is the product of the first n composite numbers.
Compositorial numbers are factorials divided by primorials.
- 4,
- 24,
- 192,
- 1728,
- 17280,
- 207360,
- ...
Common Properties of 192
The number n is abundant if the sum of all its positive divisors except itself is more than n.
They are abundant above perfection, not to mention deficiency. See perfect and deficient numbers.
The number n is called an apocalyptic power if 2n contains the consecutive digits 666 (in decimal).
A positive integer greater than 1 that is not prime is called composite.
Composite numbers are opposite to prime numbers.
A number is even if it is divisible by 2.
Numbers that are not even are odd. Compare with another pair -- evil and odious numbers.
The number n is evil if it has an even number of 1's in its binary expansion.
Guess what odious numbers are.
One can take the sum of the squares of the digits of a number. Those numbers are happy for which iterating this operation eventually leads to 1.
The number n is practical if all numbers strictly less than n are sums of distinct divisors of n.