1,900
1,900 is a composite number, even, a calendar year.
Notable events — 1900 AD
- Jun 20 The Boxer Rebellion begins as Chinese militants besiege foreign legations in Beijing.
- Sep 8 The Galveston hurricane kills an estimated 8,000-12,000 in Texas.
- Nov 6 William McKinley is re-elected US president with Theodore Roosevelt as VP.
- Dec 14 Max Planck presents his quantum hypothesis, founding quantum theory.
- Jul 2 Count Zeppelin makes the first successful flight of a rigid airship over Lake Constance.
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
- 52
- Started on
-
Monday
January 1, 1900
- Ended on
-
Monday
December 31, 1900
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Easter Sunday
-
April 15
Sunday, April 15, 1900
- Decade
-
1900s
1900–1909
- Century
-
19th century
1801–1900
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
126
126 years before 2026.
- US presidential election
-
Yes
US holds a presidential election in years divisible by 4 starting from 1788.
- Summer Olympics
- Yes
In other calendars
- Hebrew
-
5660 / 5661 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1317 / 1318 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Metal zodiac:Rat
Sexagenary cycle position 37 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2443 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1278 / 1279 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1892 / 1893 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1822 / 1821 Saka
Indian national calendar; year starts in March.
- Japanese
-
Meiji 33
Reign-era counting from the start of each emperor's reign.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 10
- Digit product
- 0
- Digital root
- 1
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 91
- Flips to (rotate 180°)
- 61
- Recamán's sequence
- a(7,944) = 1,900
- Square (n²)
- 3,610,000
- Cube (n³)
- 6,859,000,000
- Divisor count
- 18
- σ(n) — sum of divisors
- 4,340
- φ(n) — Euler's totient
- 720
- Sum of prime factors
- 33
Primality
Prime factorization: 2 2 × 5 2 × 19
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand nine hundred
- Ordinal
- 1900th
- Roman numeral
- MCM
- Binary
- 11101101100
- Octal
- 3554
- Hexadecimal
- 0x76C
- Base64
- B2w=
- One's complement
- 63,635 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹 𒌋𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢
- Greek (Milesian)
- ͵αϡʹ
- Mayan (base 20)
- 𝋤·𝋯·𝋠
- Chinese
- 一千九百
- Chinese (financial)
- 壹仟玖佰
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,900 = 6
- e — Euler's number (e)
- Digit 1,900 = 6
- φ — Golden ratio (φ)
- Digit 1,900 = 0
- √2 — Pythagoras's (√2)
- Digit 1,900 = 1
- ln 2 — Natural log of 2
- Digit 1,900 = 3
- γ — Euler-Mascheroni (γ)
- Digit 1,900 = 1
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1900, here are decompositions:
- 11 + 1889 = 1900
- 23 + 1877 = 1900
- 29 + 1871 = 1900
- 53 + 1847 = 1900
- 89 + 1811 = 1900
- 113 + 1787 = 1900
- 167 + 1733 = 1900
- 179 + 1721 = 1900
Showing the first eight; more decompositions exist.
UTF-8 encoding: DD AC (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.108.
- Address
- 0.0.7.108
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.7.108
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1900 first appears in π at position 4,791 of the decimal expansion (the 4,791ordinal-suffix:st 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.