# 818

818 is a palindrome. Write it backwards and you have 818.

818 is an ambigram or strobogrammatic number. Rotate it 180 degrees and you still have 818.

The year 818 CE was a common year (not a leap year).

The year 818 CE started on a Friday.

In the United States, the 818 area code primarily covers the San Fernando Valley of Los Angeles, California.1

818 was a short film made in 2012.2

818 is used in the Dewey Decimal System for “Authors, American and American Miscellany”, or American miscellaneous writings in English.3

In the United States, a hot dog is eaten about 818 times per second between Memorial Day and Labor Day.4

818 written in Roman numerals is DCCCXVIII.

818 written in Chinese is 捌佰壹拾捌.5

818 written in Egyptian hieroglyphics is .6

818 is a polite number, since it can be written as a sum of consecutive natural numbers ($$203+204+205+206$$).

818 is a semiprime because it is a natural number that is the product of two prime numbers ($$2×409$$).

818 is a plaindrome in base 5 ($$11233_5$$), base 7 ($$2246_7$$), and base 13 ($$4\textrm{AC}_{13}$$). A plaindrome is a number in a given base $$b$$ if its digits are in non-decreasing order in that base.

818 is a nialpdrome in base 16 ($$332_{16}$$). A number is a nialpdrome in a given base $$b$$ if its digits are in non-increasing order in that base.

818 ($$1100110010_2$$) is digitally balanced in base 2, because in such base it contains all the possible digits an equal number of times.

$$818 = 2^2 + 3^2 + 4^2 + 5^2 + 6^2 + 7^2 + 8^2 + 9^2 + 10^2 + 11^2 + 12^2 + 13^2$$

## Footnotes

1. 818 Area Code“. All Area Codes.com. Accessed July 10, 2019.
2. 818 (2018)“. IMDB.com. Accessed July 10, 2019.
3. Melvil Decimal System: 818“. LibraryThing.com. Accessed July 10, 2019.
4. Spector, Nicole. “818 Hot Dogs Eaten Every Second, and Other Memorial Day Facts“. NBC News.com. May 26, 2017. Accessed July 10, 2019.
5. 818 in Chinese numeral is 捌佰壹拾捌“. Math.Tools. Accessed July 10, 2019.
6. 818 in Egyptian numeral is “. Math.Tools. Accessed July 10, 2019.