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1800 information.

1800
Change language1800 in English words
one thousand eight hundred
MDCCC
even
Square root
42.426406871193
Binary number
11100001000
1800 in Fibonacci Sequence
No
This number consist from
4 digits
Sum of 4 digits (1+8+0+0)
9
Composite number (opposite to prime number).
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1-800-COLLECT was so popular in the 90s that AT&T launched a competing service, 1-800-Operator. However AT&T later discovered many people misspell Operator with 'er' instead of 'or' at the end, and that unfortunately, 1-800-COLLECT owned the misspelled number and had been taking their customers.
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