818
818 is a composite number, even, a calendar year.
Historical context — 818 AD
Calendar year
Year 818 (DCCCXVIII) was a common year starting on Friday of the Julian calendar.
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Historical context — 818 BC
Decade
This article concerns the period 819 BC – 810 BC.
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Year facts
- Year type
-
Common year
Standard 365-day year; not divisible by 4 (or divisible by 100 but not 400).
- Days in year
- 365
- ISO weeks
- 52
- Started on
-
Monday
January 1, 818
- Ended on
-
Monday
December 31, 818
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
810s
810–819
- Century
-
9th century
801–900
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,208
1208 years before 2026.
In other calendars
- Hebrew
-
4578 / 4579 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
202 / 203 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Earth zodiac:Dog
Sexagenary cycle position 35 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1361 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
196 / 197 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
810 / 811 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
740 / 739 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 × 409
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- eight hundred eighteen
- Ordinal
- 818th
- Roman numeral
- DCCCXVIII
- Binary
- 1100110010
- Octal
- 1462
- Hexadecimal
- 0x332
- Base64
- AzI=
- One's complement
- 64,717 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ωιηʹ
- Mayan (base 20)
- 𝋢·𝋠·𝋲
- Chinese
- 八百一十八
- Chinese (financial)
- 捌佰壹拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 818 = 3
- e — Euler's number (e)
- Digit 818 = 0
- φ — Golden ratio (φ)
- Digit 818 = 1
- √2 — Pythagoras's (√2)
- Digit 818 = 4
- ln 2 — Natural log of 2
- Digit 818 = 1
- γ — Euler-Mascheroni (γ)
- Digit 818 = 8
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 818, here are decompositions:
- 7 + 811 = 818
- 31 + 787 = 818
- 61 + 757 = 818
- 67 + 751 = 818
- 79 + 739 = 818
- 109 + 709 = 818
- 127 + 691 = 818
- 157 + 661 = 818
Showing the first eight; more decompositions exist.
UTF-8 encoding: CC B2 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.50.
- Address
- 0.0.3.50
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.3.50
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 818 is an active NANP area code (North American Numbering Plan).
- Primary area
- San Fernando Valley
- Region
- California
- Country
- United States
Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.
Type 818 on a seven-segment calculator, flip it 180°, and the display reads:
BIB
A staple of calculator humor since pocket calculators put digits in front of bored students.