Number

855

855 is a composite number, odd, a calendar year.

Arithmetic Number Decagonal Deficient Number Odious Number Pernicious Number Recamán's Sequence Year

Historical context — 855 AD

Calendar year

Year 855 (DCCCLV) was a common year starting on Tuesday of the Julian calendar.

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Historical context — 855 BC

Decade

This article concerns the period 859 BC – 850 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: Friday
January 1, 855
Ended on: Friday
December 31, 855
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 850s
850–859
Century: 9th century
801–900
Millennium: 1st millennium
1–1000
Years ago: 1,171
1171 years before 2026.

In other calendars

Hebrew: 4615 / 4616 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 240 / 241 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Wood zodiac:Pig
Sexagenary cycle position 12 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1398 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 233 / 234 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 847 / 848 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 777 / 776 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 18
Digit product: 200
Digital root: 9
Palindrome: No
Bit width: 10 bits
Reversed: 558
Recamán's sequence: a(821) = 855
Square (n²): 731,025
Cube (n³): 625,026,375
Divisor count: 12
σ(n) — sum of divisors: 1,560
φ(n) — Euler's totient: 432
Sum of prime factors: 30

Primality

Prime factorization: 3 ² × 5 × 19

Nearest primes: 853 (−2) · 857 (+2)

Divisors & multiples

All divisors (12)

1 · 3 · 5 · 9 · 15 · 19 · 45 · 57 · 95 · 171 · 285 · 855

Aliquot sum (sum of proper divisors): 705

Factor pairs (a × b = 855)

1 × 855

3 × 285

5 × 171

9 × 95

15 × 57

19 × 45

First multiples

855 · 1,710 (double) · 2,565 · 3,420 · 4,275 · 5,130 · 5,985 · 6,840 · 7,695 · 8,550

Sums & aliquot sequence

As consecutive integers: 427 + 428 284 + 285 + 286 169 + 170 + 171 + 172 + 173 140 + 141 + 142 + 143 + 144 + 145

Aliquot sequence: 855 → 705 → 447 → 153 → 81 → 40 → 50 → 43 → 1 → 0 — terminates at zero

Representations

In words: eight hundred fifty-five
Ordinal: 855th
Roman numeral: DCCCLV
Binary: 1101010111
Octal: 1527
Hexadecimal: 0x357
Base64: A1c=
One's complement: 64,680 (16-bit)

In other bases

ternary (3) 1011200

quaternary (4) 31113

quinary (5) 11410

senary (6) 3543

septenary (7) 2331

nonary (9) 1150

undecimal (11) 708

duodecimal (12) 5b3

tridecimal (13) 50a

tetradecimal (14) 451

pentadecimal (15) 3c0

Historical numeral systems

Babylonian (base 60): 𒌋𒁹𒁹𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): ωνεʹ
Mayan (base 20): 𝋢·𝋢·𝋯
Chinese: 八百五十五
Chinese (financial): 捌佰伍拾伍

In other modern scripts

Eastern Arabic ٨٥٥ Devanagari ८५५ Bengali ৮৫৫ Tamil ௮௫௫ Thai ๘๕๕ Tibetan ༨༥༥ Khmer ៨៥៥ Lao ໘໕໕ Burmese ၈၅၅

Digit at this position in famous constants

π — Pi (π): Digit 855 = 1
e — Euler's number (e): Digit 855 = 4
φ — Golden ratio (φ): Digit 855 = 1
√2 — Pythagoras's (√2): Digit 855 = 3
ln 2 — Natural log of 2: Digit 855 = 6
γ — Euler-Mascheroni (γ): Digit 855 = 9

Also seen as

Unicode codepoint

Combining Right Half Ring Above

U+0357

Non-spacing mark (Mn)

UTF-8 encoding: CD 97 (2 bytes).

Lookup U+0357 on Compart ↗ Lookup on FileFormat.Info ↗

Code page identifier

Code page 855 is DOS Cyrillic — DOS code page for Cyrillic alphabets.

Code pages are integer identifiers used by Windows and other systems to refer to specific character encodings.

Microsoft code page reference ↗

Hex color

#000357

RGB(0, 3, 87)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.87.

Address: 0.0.3.87
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.3.87

Unspecified address (0.0.0.0/8) — "this network" placeholder.

NANP area code 855

The number 855 is an active NANP area code (North American Numbering Plan).

Primary area: Toll-free
Region: (special)
Country: North America

Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.

Look up area code 855 ↗