About the Number 285 (two hundred eighty-five)

285 was the smallest number that didn't have a nBAB on 14 April 2016. MathBabbler is trying to ensure that the numbers 0-300 have nBABs by the end of the Spring 2016 Semester. With the posting of this nBAB for 285, 287 became the smallest number without a nBAB on 14 April 2016.

MathBabbler Number Analyst (MBNA) output:
=========================================
285 is a natural, whole, integer
285 is odd
285 proper divisors are: 1,3,5,15,19,57,95,
285 has 7 proper divisors
285 is deficient (sum of divisors is 195; ratio: 0.684211)
285 is unhappy
285 is a Squarefree Number
285 is Harshad (Niven) number
285 is composite (not prime)
285 has the prime factors: 3*5*19 (sum=27)
285 is sphenic (had 3 unique prime factors)
285 is a 19-smooth number
285 is a Moran Number
285 is a lucky number
285 is Arithmetic (A003601)
285 in octal is 0435
285 in hexadecimal is 0x11d
285 in binary is 100011101 (is odious)
285 nearest square numbers: -29...4 (256...289 [17])
sqrt(285) = 16.8819
ln(285) = 5.65249
log(285) = 2.45484
285 reciprocal is .00350877192982456140350877192982
285 is an apocalyptic power
285! is 3.04437e+577
285 is 90.7183 Pi years
285 is 14 score and 5 years
285 written as a Roman numeral is CCLXXXV
285 is 143^2 - 142^2 and 143 + 142 = 285
285 is a multiple of 5 & it contains a 5 (A121025)

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 14 April 2016

Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 United States License.