While creating a collection of square numbers, MathBabbler was surprised to learn he didn't have a nBAB for the number
400
.MathBabbler Number Analyst (MBNA) output: ========================================= 400 is a natural, whole, integer 400 is even 400 proper divisors are: 1,2,4,5,8,10,16,20,25,40,50,80,100,200, 400 is abundant (sum of divisors is 561) 400 is unhappy 400 is a Harshad number 400 is not prime 400 has the prime factors: 2*2*2*2*5*5 400 sum prime factors: 18 400 in octal is 0620 400 in hexadecimal is 0x190 400 in binary is 110010000 (is odious) 400 is a square number sqrt(400) = 20 ln(400) = 5.99146 log(400) = 2.60206 400 is 20^2 400 reciprocal is .00250000000000000000000000000000 400! is 6.40345e+868 400 is 127.324 Pi years 400 is 20 scoreyears 400 written as a Roman numeral is CDUpdate::2009.08.25
On 25 August 2009, Google morphed its logo to celebrate the 400th anniversary of Italian astronomer Galilei Galileo's demonstration of his telescope.
Between the time this nBAB was created (10 April 2009) and the time of this update, the basen program was written and it produced the following output.
400
in base-16 is 1024 (i.e. 2^10).
400
in base-15 is square number 900.
400
in base-8 is 256 (i.e. 2^8).
400
in base-7 is square number 196 (i.e. 14^2).
400
in base-6 is square number 144 (i.e. 12^2).
400
in base-5 is square number 100 (i.e. 10^2).Update::2009.12.15
MathBabbler posted his
400
th tweet on 15 December 2009. MathBabbler has been tweeting at a rate of almost 2.1 tweets per day since posting his first tweet on 8 June 2009.Between the date this nBAB was last updated (25 August 2009) and the date of this update, the logs program was written and it reported that
log9(400)
(2.72683)
truncated to two-decimal digits equals e(2.7182818284590)
rounded to the nearest hundredth.MathBABs.us::Number Basic Arithmetic Bits (BABs) Homepage
Creator: Gerald Thurman
[gthurman@gmail.com]
Created: 10 April 2009 (posted 13 May 2009)