1,818
1,818 is a composite number, even, a calendar year.
Notable events — 1818 AD
- Oct 20 The Anglo-American Convention sets the US-Canada border along the 49th parallel.
- Dec 3 Illinois becomes the 21st US state.
- Feb 12 Chile formally declares independence at Talca.
- Mar 24 Lord Byron publishes Childe Harold's Pilgrimage Canto IV.
- Jan 1 Mary Shelley anonymously publishes Frankenstein.
Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0
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
-
53
Long year: contains 53 ISO weeks.
- Started on
-
Thursday
January 1, 1818
- Ended on
-
Thursday
December 31, 1818
- Friday the 13ths
-
3
3 Friday the 13ths this year.
- Easter Sunday
-
March 22
Sunday, March 22, 1818
- Decade
-
1810s
1810–1819
- Century
-
19th century
1801–1900
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
208
208 years before 2026.
In other calendars
- Hebrew
-
5578 / 5579 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1233 / 1234 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Earth zodiac:Tiger
Sexagenary cycle position 15 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2361 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1196 / 1197 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1810 / 1811 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1740 / 1739 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 18
- Digit product
- 64
- Digital root
- 9
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 8,181
- Flips to (rotate 180°)
- 8,181
- Recamán's sequence
- a(459) = 1,818
- Square (n²)
- 3,305,124
- Cube (n³)
- 6,008,715,432
- Divisor count
- 12
- σ(n) — sum of divisors
- 3,978
- φ(n) — Euler's totient
- 600
- Sum of prime factors
- 109
Primality
Prime factorization: 2 × 3 2 × 101
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand eight hundred eighteen
- Ordinal
- 1818th
- Roman numeral
- MDCCCXVIII
- Binary
- 11100011010
- Octal
- 3432
- Hexadecimal
- 0x71A
- Base64
- Bxo=
- One's complement
- 63,717 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵αωιηʹ
- Mayan (base 20)
- 𝋤·𝋪·𝋲
- Chinese
- 一千八百一十八
- Chinese (financial)
- 壹仟捌佰壹拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,818 = 0
- e — Euler's number (e)
- Digit 1,818 = 2
- φ — Golden ratio (φ)
- Digit 1,818 = 9
- √2 — Pythagoras's (√2)
- Digit 1,818 = 3
- ln 2 — Natural log of 2
- Digit 1,818 = 4
- γ — Euler-Mascheroni (γ)
- Digit 1,818 = 9
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1818, here are decompositions:
- 7 + 1811 = 1818
- 17 + 1801 = 1818
- 29 + 1789 = 1818
- 31 + 1787 = 1818
- 41 + 1777 = 1818
- 59 + 1759 = 1818
- 71 + 1747 = 1818
- 97 + 1721 = 1818
Showing the first eight; more decompositions exist.
UTF-8 encoding: DC 9A (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.26.
- Address
- 0.0.7.26
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.7.26
Unspecified address (0.0.0.0/8) — "this network" placeholder.
This passes the ABA routing number checksum and matches the Federal Reserve numbering scheme.
Banks operate many routing numbers per state and division; an unmatched checksum-valid number can still be a real RTN at a smaller institution.
The digit sequence 1818 first appears in π at position 1,572 of the decimal expansion (the 1,572ordinal-suffix:nd digit after the integer 3).
Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.