890
890 is a composite number, even, a calendar year.
Historical context — 890 AD
Calendar year
Year 890 (DCCCXC) was a common year starting on Thursday of the Julian calendar, the 890th year of the Common Era (CE) and Anno Domini (AD) designations, the 890th year of the 1st millennium, the 90th year of the 9th century, and the 1st year of the 890s decade.
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Historical context — 890 BC
Decade
This article concerns the period 899 BC – 890 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
-
Sunday
January 1, 890
- Ended on
-
Sunday
December 31, 890
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
890s
890–899
- Century
-
9th century
801–900
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,136
1136 years before 2026.
In other calendars
- Hebrew
-
4650 / 4651 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
276 / 277 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Metal zodiac:Dog
Sexagenary cycle position 47 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1433 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
268 / 269 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
882 / 883 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
812 / 811 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Even
- Digit count
- 3
- Digit sum
- 17
- Digit product
- 0
- Digital root
- 8
- Palindrome
- No
- Bit width
- 10 bits
- Reversed
- 98
- Flips to (rotate 180°)
- 68
- Recamán's sequence
- a(531) = 890
- Square (n²)
- 792,100
- Cube (n³)
- 704,969,000
- Divisor count
- 8
- σ(n) — sum of divisors
- 1,620
- φ(n) — Euler's totient
- 352
- Sum of prime factors
- 96
Primality
Prime factorization: 2 × 5 × 89
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- eight hundred ninety
- Ordinal
- 890th
- Roman numeral
- DCCCXC
- Binary
- 1101111010
- Octal
- 1572
- Hexadecimal
- 0x37A
- Base64
- A3o=
- One's complement
- 64,645 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ωϟʹ
- Mayan (base 20)
- 𝋢·𝋤·𝋪
- Chinese
- 八百九十
- Chinese (financial)
- 捌佰玖拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 890 = 1
- e — Euler's number (e)
- Digit 890 = 6
- φ — Golden ratio (φ)
- Digit 890 = 2
- √2 — Pythagoras's (√2)
- Digit 890 = 9
- ln 2 — Natural log of 2
- Digit 890 = 2
- γ — Euler-Mascheroni (γ)
- Digit 890 = 2
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 890, here are decompositions:
- 3 + 887 = 890
- 7 + 883 = 890
- 13 + 877 = 890
- 31 + 859 = 890
- 37 + 853 = 890
- 61 + 829 = 890
- 67 + 823 = 890
- 79 + 811 = 890
Showing the first eight; more decompositions exist.
UTF-8 encoding: CD BA (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.122.
- Address
- 0.0.3.122
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.3.122
Unspecified address (0.0.0.0/8) — "this network" placeholder.