### About the Number 18,000 (eighteen thousand)

The DJIA hit 18,000 for the first time on 23 December 2014.

```MathBabbler Number Analyst (MBNA) output:
=========================================
18000 is a natural, whole, integer
18000 is even
18000 proper divisors are: 1,2,3,4,5,6,8,9,10,12,15,16,18,20,24,25,30,36,
40,45,48,50,60,72,75,80,90,100,120,125,144,150,
180,200,225,240,250,300,360,375,400,450,500,600,
720,750,900,1000,1125,1200,1500,1800,2000,2250,
3000,3600,4500,6000,9000,
18000 is refactorable (evenly divisable  by # of divisors)
18000 has 59 proper divisors
18000 is abundant (sum of divisors is 44868; ratio: 2.49267)
18000 is unhappy
18000 is not a Squarefree Number: 4,9,16,25,36,100,144,225,400,900,3600,
18000 is Harshad (Niven) number
18000 is composite (not prime)
18000 has the prime factors: 2*2*2*2*3*3*5*5*5 (sum=29)
18000 is the sum of 3 distinct cubes (1^3 + 18^3 + 23^3)
18000 is powerful (12^2*5^3)
18000 is not in A038853
18000 in octal is 043120
18000 in hexadecimal is 0x4650
18000 in binary is 100011001010000 (is odious)
18000 nearest square numbers: -44...225 (17956...18225 )
sqrt(18000) = 134.164
ln(18000) = 9.79813
log(18000) = 4.25527
18000 reciprocal is .00005555555555555555555555555555
18000 is an apocalyptic power
18000! is inf
18000 is 5729.58 Pi years
18000 is 900 scoreyears
18000 is 4501^2 - 4499^2 and 2 * (4501 + 4499)
18000 is a multiple of 1 & it contains a 1 (A011531)
18000 is a multiple of 8 & it contains a 8 (A121028)
18000 is a multiple of 18 & it contains a 18 (A121038)
18000 is a multiple of 80 & it contains a 80
18000 is a multiple of 180 & it contains a 180
18000 is a multiple of 1800 & it contains a 1800
```

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 23 December 2014 (posted 25 December 2014) 