860
860 is a composite number, even, a calendar year.
860 (eight hundred sixty) is an even 3-digit number. It is a composite number with 12 divisors, and factors as 2² × 5 × 43. Its proper divisors sum to 988, more than the number itself, making it an abundant number. Written other ways, in Roman numerals it is DCCCLX and in binary, 1101011100.
Interestingness
Historical context — 860 AD
Calendar year
Year 860 (DCCCLX) was a leap year starting on Monday of the Julian calendar.
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Historical context — 860 BC
Decade
This article concerns the period 869 BC – 860 BC.
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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
-
Thursday
January 1, 860
- Ended on
-
Friday
December 31, 860
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
860s
860–869
- Century
-
9th century
801–900
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,166
1166 years before 2026.
In other calendars
- Hebrew
-
4620 / 4621 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
245 / 246 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Metal zodiac:Dragon
Sexagenary cycle position 17 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1403 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
238 / 239 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
852 / 853 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
782 / 781 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Even
- Digit count
- 3
- Digit sum
- 14
- Digit product
- 0
- Digital root
- 5
- Palindrome
- No
- Bit width
- 10 bits
- Reversed
- 68
- Flips to (rotate 180°)
- 98
- Recamán's sequence
- a(811) = 860
- Square (n²)
- 739,600
- Cube (n³)
- 636,056,000
- Divisor count
- 12
- σ(n) — sum of divisors
- 1,848
- φ(n) — Euler's totient
- 336
- Sum of prime factors
- 52
Primality
Prime factorization: 2 2 × 5 × 43
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√860 = [29; (3, 14, 3, 58)]
Period length 4 — the block in parentheses repeats forever.
Representations
- In words
- eight hundred sixty
- Ordinal
- 860th
- Roman numeral
- DCCCLX
- Binary
- 1101011100
- Octal
- 1534
- Hexadecimal
- 0x35C
- Base64
- A1w=
- One's complement
- 64,675 (16-bit)
- Scientific notation
- 8.6 × 10²
- As a duration
- 860 s = 14 minutes, 20 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹𒁹 𒌋𒌋
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ωξʹ
- Mayan (base 20)
- 𝋢·𝋣·𝋠
- Chinese
- 八百六十
- Chinese (financial)
- 捌佰陸拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 860 = 1
- e — Euler's number (e)
- Digit 860 = 0
- φ — Golden ratio (φ)
- Digit 860 = 4
- √2 — Pythagoras's (√2)
- Digit 860 = 2
- ln 2 — Natural log of 2
- Digit 860 = 1
- γ — Euler-Mascheroni (γ)
- Digit 860 = 8
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 860, here are decompositions:
- 3 + 857 = 860
- 7 + 853 = 860
- 31 + 829 = 860
- 37 + 823 = 860
- 73 + 787 = 860
- 103 + 757 = 860
- 109 + 751 = 860
- 127 + 733 = 860
Showing the first eight; more decompositions exist.
UTF-8 encoding: CD 9C (2 bytes).
Code page 860 is DOS Portuguese — DOS code page for Portuguese.
Code pages are integer identifiers used by Windows and other systems to refer to specific character encodings.
As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.92.
- Address
- 0.0.3.92
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.3.92
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 860 is an active NANP area code (North American Numbering Plan).
- Primary area
- Hartford / New London
- Region
- Connecticut
- 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.
Heard as a frequency, 860 Hz is closest to:
- Concert pitch (A4 = 440 Hz): A5 (880 Hz, -40¢)
- Scientific pitch (C4 = 256 Hz): A5 (861.1 Hz, -2¢)
- Baroque pitch (A4 = 415 Hz): A♯5 (879.4 Hz, -39¢)
Related reading
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.