Number

899

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

Arithmetic Number Deficient Number Flippable Happy Number Odious Number Pernicious Number Recamán's Sequence Semiprime Squarefree Year

Historical context — 899 AD

Calendar year

Year 899 (DCCCXCIX) was a common year starting on Monday of the Julian calendar.

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Historical context — 899 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: 53
Long year: contains 53 ISO weeks.
Started on: Thursday
January 1, 899
Ended on: Thursday
December 31, 899
Friday the 13ths: 3
3 Friday the 13ths this year.
Decade: 890s
890–899
Century: 9th century
801–900
Millennium: 1st millennium
1–1000
Years ago: 1,127
1127 years before 2026.

In other calendars

Hebrew: 4659 / 4660 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 285 / 286 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Earth zodiac:Goat
Sexagenary cycle position 56 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1442 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 277 / 278 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 891 / 892 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 821 / 820 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 26
Digit product: 648
Digital root: 8
Palindrome: No
Bit width: 10 bits
Reversed: 998
Flips to (rotate 180°): 668
Recamán's sequence: a(409) = 899
Square (n²): 808,201
Cube (n³): 726,572,699
Divisor count: 4
σ(n) — sum of divisors: 960
φ(n) — Euler's totient: 840
Sum of prime factors: 60

Primality

Prime factorization: 29 × 31

Nearest primes: 887 (−12) · 907 (+8)

Divisors & multiples

All divisors (4)

1 · 29 · 31 · 899

Aliquot sum (sum of proper divisors): 61

Factor pairs (a × b = 899)

1 × 899

29 × 31

First multiples

899 · 1,798 (double) · 2,697 · 3,596 · 4,495 · 5,394 · 6,293 · 7,192 · 8,091 · 8,990

Sums & aliquot sequence

As consecutive integers: 449 + 450 17 + 18 + … + 45 14 + 15 + … + 44

Aliquot sequence: 899 → 61 → 1 → 0 — terminates at zero

Representations

In words: eight hundred ninety-nine
Ordinal: 899th
Roman numeral: DCCCXCIX
Binary: 1110000011
Octal: 1603
Hexadecimal: 0x383
Base64: A4M=
One's complement: 64,636 (16-bit)

In other bases

ternary (3) 1020022

quaternary (4) 32003

quinary (5) 12044

senary (6) 4055

septenary (7) 2423

nonary (9) 1208

undecimal (11) 748

duodecimal (12) 62b

tridecimal (13) 542

tetradecimal (14) 483

pentadecimal (15) 3ee

Historical numeral systems

Babylonian (base 60): 𒌋𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): ωϟθʹ
Mayan (base 20): 𝋢·𝋤·𝋳
Chinese: 八百九十九
Chinese (financial): 捌佰玖拾玖

In other modern scripts

Eastern Arabic ٨٩٩ Devanagari ८९९ Bengali ৮৯৯ Tamil ௮௯௯ Thai ๘๙๙ Tibetan ༨༩༩ Khmer ៨៩៩ Lao ໘໙໙ Burmese ၈၉၉

Digit at this position in famous constants

π — Pi (π): Digit 899 = 3
e — Euler's number (e): Digit 899 = 0
φ — Golden ratio (φ): Digit 899 = 2
√2 — Pythagoras's (√2): Digit 899 = 1
ln 2 — Natural log of 2: Digit 899 = 5
γ — Euler-Mascheroni (γ): Digit 899 = 9

Also seen as

Hex color

#000383

RGB(0, 3, 131)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.131.

Address: 0.0.3.131
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.3.131

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