Kaprekar also described the Harshad numbers which he named harshad, meaning "giving joy" ( Sanskrit harsha , joy +da taddhita pratyaya, causative ); these are defined by the property that they are divisible by the sum of their digits. Thus 12, which is divisible by 1 + 2 = 3, is a Harshad number. These were later also called Niven numbers after a 1977 lecture on these by the Canadian mathematician Ivan M. Niven . Numbers which are Harshad in all bases (only 1, 2, 4, and 6) are called all-Harshad numbers . Much work has been done on Harshad numbers, and their distribution, frequency, etc. are a matter of considerable interest in number theory today.
Every improvement you make is for your workplace safety and to improve your safety program. Chances are you will never need one of these silent guardian angels of the workplace. Safety professionals spend entire careers and never know of one accident using a safety shower or eyewash station. All our effort is preventative, hoping never to be needed. But , if just one employee ever needs and uses an emergency eyewash/shower and everything you as a safety professional has done works exactly as designed and he/she is not as injured because of your efforts, it is all worth it.