### About the Number 1,881 (one thousand eight hundred eighty-one)

The emoticon was born on 30 March 1881.

```MathBabbler Number Analyst (MBNA) output:
=========================================
1881 is a natural, whole, integer
1881 is odd
1881 proper divisors are: 1,3,9,11,19,33,57,99,171,209,627,
1881 has 11 proper divisors
1881 is deficient (sum of divisors is 1239; ratio: 0.658692)
1881 is happy
1881 is not a Squarefree Number: 9,
1881 is composite (not prime)
1881 has the prime factors: 3*3*11*19 (sum=36)
1881 is a joke (Smith) number
1881 is palindromic
1881 is Arithmetic (A003601)
1881 in octal is 03531
1881 in hexadecimal is 0x759
1881 in binary is 11101011001 (is odious)
1881 nearest square numbers: -32...55 (1849...1936 )
sqrt(1881) = 43.3705
ln(1881) = 7.53956
log(1881) = 3.27439
1881 reciprocal is .00053163211057947900053163211057
1881 is an apocalyptic power
1881! is inf
1881 is 598.741 Pi years
1881 is 94 score and 1 year
1881 written as a Roman numeral is MDCCCLXXXI
1881 is 941^2 - 940^2 and 941 + 940 = 1881
1881 is a multiple of 1 & it contains a 1 (A011531)
```

log11(`1881`) = 3.14424, which when rounded to the nearest hundreth is Pi (3.14159265...) rounded to the nearest hundredth.

log16(`1881`) = 2.71932, which when rounded to the nearest hundreth is e (2.71828182...) rounded to the nearest hundreth.

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 30 March 2015 