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Number

189

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

Arithmetic Number Ascending Digits Deficient Number Evil Number Flippable Heptagonal Recamán's Sequence Year

Historical context — 189 AD

Calendar year

Year 189 (CLXXXIX) was a common year starting on Wednesday of the Julian calendar.

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Historical context — 189 BC

Calendar year

Year 189 BC was a year of the pre-Julian Roman calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 · English fallback Read the full article on Wikipedia →

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, 189
Ended on: Thursday
December 31, 189
Friday the 13ths: 3
3 Friday the 13ths this year.
Decade: 180s
180–189
Century: 2nd century
101–200
Millennium: 1st millennium
1–1000
Years ago: 1,837
1837 years before 2026.

In other calendars

Hebrew: 3949 / 3950 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Earth zodiac:Snake
Sexagenary cycle position 6 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 732 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 181 / 182 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 111 / 110 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 18
Digit product: 72
Digital root: 9
Palindrome: No
Bit width: 8 bits
Reversed: 981
Flips to (rotate 180°): 681
Recamán's sequence: a(1,393) = 189
Square (n²): 35,721
Cube (n³): 6,751,269
Divisor count: 8
σ(n) — sum of divisors: 320
φ(n) — Euler's totient: 108
Sum of prime factors: 16

Primality

Prime factorization: 3 ³ × 7

Nearest primes: 181 (−8) · 191 (+2)

Divisors & multiples

All divisors (8)

1 · 3 · 7 · 9 · 21 · 27 · 63 · 189

Aliquot sum (sum of proper divisors): 131

Factor pairs (a × b = 189)

1 × 189

3 × 63

7 × 27

9 × 21

First multiples

189 · 378 (double) · 567 · 756 · 945 · 1,134 · 1,323 · 1,512 · 1,701 · 1,890

Sums & aliquot sequence

As consecutive integers: 94 + 95 62 + 63 + 64 29 + 30 + 31 + 32 + 33 + 34 24 + 25 + … + 30

Aliquot sequence: 189 → 131 → 1 → 0 — terminates at zero

Representations

In words: one hundred eighty-nine
Ordinal: 189th
Roman numeral: CLXXXIX
Binary: 10111101
Octal: 275
Hexadecimal: 0xBD
Base64: vQ==
One's complement: 66 (8-bit)

In other bases

ternary (3) 21000

quaternary (4) 2331

quinary (5) 1224

senary (6) 513

septenary (7) 360

nonary (9) 230

undecimal (11) 162

duodecimal (12) 139

tridecimal (13) 117

tetradecimal (14) d7

pentadecimal (15) c9

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): ρπθʹ
Mayan (base 20): 𝋩·𝋩
Chinese: 一百八十九
Chinese (financial): 壹佰捌拾玖

In other modern scripts

Eastern Arabic ١٨٩ Devanagari १८९ Bengali ১৮৯ Tamil ௧௮௯ Thai ๑๘๙ Tibetan ༡༨༩ Khmer ១៨៩ Lao ໑໘໙ Burmese ၁၈၉

Digit at this position in famous constants

π — Pi (π): Digit 189 = 4
e — Euler's number (e): Digit 189 = 5
φ — Golden ratio (φ): Digit 189 = 1
√2 — Pythagoras's (√2): Digit 189 = 5
ln 2 — Natural log of 2: Digit 189 = 9
γ — Euler-Mascheroni (γ): Digit 189 = 9

Also seen as

Unicode codepoint

½

Vulgar Fraction One Half

U+00BD

Other number (No)

UTF-8 encoding: C2 BD (2 bytes).

Lookup U+00BD on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0000BD

RGB(0, 0, 189)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.189.

Address: 0.0.0.189
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.189

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