Number

190

190 is a composite number, even, a calendar year.

190 (one hundred ninety) is an even 3-digit number. It is a composite number with 8 divisors, and factors as 2 × 5 × 19. It is the nineteenth triangular number. Written other ways, in Roman numerals it is CXC and in binary, 10111110.

Arithmetic Number Cube-Free Deficient Number Evil Number Flippable Gapful Number Happy Number Harshad / Niven Hexagonal Moran Number Recamán's Sequence Sphenic Number Squarefree Triangular Year

Interestingness

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12 notable facts · grade A

178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202

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Historical context — 190 AD

Calendar year

Year 190 (CXC) was a common year starting on Thursday of the Julian calendar.

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

Historical context — 190 BC

Calendar year

Year 190 BC was a year of the pre-Julian Roman calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 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: 52
Started on: Friday
January 1, 190
Ended on: Friday
December 31, 190
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 190s
190–199
Century: 2nd century
101–200
Millennium: 1st millennium
1–1000
Years ago: 1,836
1836 years before 2026.

In other calendars

Hebrew: 3950 / 3951 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Metal zodiac:Horse
Sexagenary cycle position 7 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 733 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 182 / 183 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 112 / 111 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 3
Digit sum: 10
Digit product: 0
Digital root: 1
Palindrome: No
Bit width: 8 bits
Reversed: 91
Flips to (rotate 180°): 61
Recamán's sequence: a(1,391) = 190
Square (n²): 36,100
Cube (n³): 6,859,000
Divisor count: 8
σ(n) — sum of divisors: 360
φ(n) — Euler's totient: 72
Sum of prime factors: 26

Primality

Prime factorization: 2 × 5 × 19

Nearest primes: 181 (−9) · 191 (+1)

Divisors & multiples

All divisors (8)

1 · 2 · 5 · 10 · 19 · 38 · 95 (half) · 190

Aliquot sum (sum of proper divisors): 170

Factor pairs (a × b = 190)

1 × 190

2 × 95

5 × 38

10 × 19

First multiples

190 · 380 (double) · 570 · 760 · 950 · 1,140 · 1,330 · 1,520 · 1,710 · 1,900

Sums & aliquot sequence

As consecutive integers: 46 + 47 + 48 + 49 36 + 37 + 38 + 39 + 40 1 + 2 + … + 19

Aliquot sequence: 190 → 170 → 154 → 134 → 70 → 74 → 40 → 50 → 43 → 1 → 0 — terminates at zero

Continued fraction of √n

√190 = [13; (1, 3, 1, 1, 1, 2, 2, 2, 1, 1, 1, 3, 1, 26)]

Period length 14 — the block in parentheses repeats forever.

Representations

In words: one hundred ninety
Ordinal: 190th
Roman numeral: CXC
Binary: 10111110
Octal: 276
Hexadecimal: 0xBE
Base64: vg==
One's complement: 65 (8-bit)
Scientific notation: 1.9 × 10²
As a duration: 190 s = 3 minutes, 10 seconds

In other bases

ternary (3) 21001

quaternary (4) 2332

quinary (5) 1230

senary (6) 514

septenary (7) 361

nonary (9) 231

undecimal (11) 163

duodecimal (12) 13a

tridecimal (13) 118

tetradecimal (14) d8

pentadecimal (15) ca

Palindromic in base 4

As an angle

190°

190° ≈ 3.316 rad

Compass bearing: S (south)

Why does a circle have 360 degrees? →

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹 𒌋
Egyptian hieroglyphic: 𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆
Greek (Milesian): ρϟʹ
Mayan (base 20): 𝋩·𝋪
Chinese: 一百九十
Chinese (financial): 壹佰玖拾

In other modern scripts

Eastern Arabic ١٩٠ Devanagari १९० Bengali ১৯০ Tamil ௧௯௦ Thai ๑๙๐ Tibetan ༡༩༠ Khmer ១៩០ Lao ໑໙໐ Burmese ၁၉၀

Digit at this position in famous constants

π — Pi (π): Digit 190 = 8
e — Euler's number (e): Digit 190 = 3
φ — Golden ratio (φ): Digit 190 = 9
√2 — Pythagoras's (√2): Digit 190 = 2
ln 2 — Natural log of 2: Digit 190 = 1
γ — Euler-Mascheroni (γ): Digit 190 = 5

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 190, here are decompositions:

11 + 179 = 190
17 + 173 = 190
23 + 167 = 190
41 + 149 = 190
53 + 137 = 190
59 + 131 = 190
83 + 107 = 190
89 + 101 = 190

Showing the first eight; more decompositions exist.

Unicode codepoint

Vulgar Fraction Three Quarters

U+00BE

Other number (No)

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

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

Hex color

#0000BE

RGB(0, 0, 190)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.190.

Address: 0.0.0.190
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.190

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

Musical pitch

Heard as a frequency, 190 Hz is closest to:

Concert pitch (A4 = 440 Hz): F♯3 (185 Hz, +46¢ — about midway to G3)
Scientific pitch (C4 = 256 Hz): G3 (191.8 Hz, -16¢)
Baroque pitch (A4 = 415 Hz): G3 (184.9 Hz, +47¢ — about midway to G♯3)