1,868
1,868 is a composite number, even, a calendar year.
Notable events — 1868 AD
- Feb 24 President Andrew Johnson is impeached by the US House of Representatives.
- May 26 Johnson is acquitted in the Senate by one vote.
- Jul 9 The 14th Amendment is ratified, granting birthright citizenship.
- Nov 3 Ulysses S. Grant is elected US president.
- Jan 3 The Meiji Restoration ends the Tokugawa shogunate in Japan.
Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0
Year facts
- Year type
-
Leap year
Divisible by 4 and not by 100; February has 29 days.
- Days in year
- 366
- ISO weeks
-
53
Long year: contains 53 ISO weeks.
- Started on
-
Wednesday
January 1, 1868
- Ended on
-
Thursday
December 31, 1868
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Easter Sunday
-
April 12
Sunday, April 12, 1868
- Decade
-
1860s
1860–1869
- Century
-
19th century
1801–1900
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
158
158 years before 2026.
- US presidential election
-
Yes
US holds a presidential election in years divisible by 4 starting from 1788.
In other calendars
- Hebrew
-
5628 / 5629 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1284 / 1285 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Earth zodiac:Dragon
Sexagenary cycle position 5 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2411 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1246 / 1247 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1860 / 1861 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1790 / 1789 Saka
Indian national calendar; year starts in March.
- Japanese
-
Meiji 1
Reign-era counting from the start of each emperor's reign.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 23
- Digit product
- 384
- Digital root
- 5
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 8,681
- Flips to (rotate 180°)
- 8,981
- Recamán's sequence
- a(8,008) = 1,868
- Square (n²)
- 3,489,424
- Cube (n³)
- 6,518,244,032
- Divisor count
- 6
- σ(n) — sum of divisors
- 3,276
- φ(n) — Euler's totient
- 932
- Sum of prime factors
- 471
Primality
Prime factorization: 2 2 × 467
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand eight hundred sixty-eight
- Ordinal
- 1868th
- Roman numeral
- MDCCCLXVIII
- Binary
- 11101001100
- Octal
- 3514
- Hexadecimal
- 0x74C
- Base64
- B0w=
- One's complement
- 63,667 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵αωξηʹ
- Mayan (base 20)
- 𝋤·𝋭·𝋨
- Chinese
- 一千八百六十八
- Chinese (financial)
- 壹仟捌佰陸拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,868 = 4
- e — Euler's number (e)
- Digit 1,868 = 2
- φ — Golden ratio (φ)
- Digit 1,868 = 8
- √2 — Pythagoras's (√2)
- Digit 1,868 = 7
- ln 2 — Natural log of 2
- Digit 1,868 = 7
- γ — Euler-Mascheroni (γ)
- Digit 1,868 = 0
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1868, here are decompositions:
- 7 + 1861 = 1868
- 37 + 1831 = 1868
- 67 + 1801 = 1868
- 79 + 1789 = 1868
- 109 + 1759 = 1868
- 127 + 1741 = 1868
- 199 + 1669 = 1868
- 211 + 1657 = 1868
Showing the first eight; more decompositions exist.
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.76.
- Address
- 0.0.7.76
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.7.76
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1868 first appears in π at position 10,216 of the decimal expansion (the 10,216ordinal-suffix:th 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.