188
188 is a composite number, even, a calendar year.
188 (one hundred eighty-eight) is an even 3-digit number. It is a composite number with 6 divisors, and factors as 2² × 47. Written other ways, in Roman numerals it is CLXXXVIII and in binary, 10111100.
Interestingness
Historical context — 188 AD
Calendar year
Year 188 (CLXXXVIII) was a leap year starting on Monday of the Julian calendar.
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Historical context — 188 BC
Calendar year
Year 188 BC was a year of the pre-Julian Roman calendar.
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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
- 52
- Started on
-
Tuesday
January 1, 188
- Ended on
-
Wednesday
December 31, 188
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
180s
180–189
- Century
-
2nd century
101–200
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,838
1838 years before 2026.
In other calendars
- Hebrew
-
3948 / 3949 AM
Rosh Hashanah falls in September/October.
- Chinese
-
Year of the zodiac:Earth zodiac:Dragon
Sexagenary cycle position 5 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
731 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
180 / 181 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
110 / 109 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Even
- Digit count
- 3
- Digit sum
- 17
- Digit product
- 64
- Digital root
- 8
- Palindrome
- No
- Bit width
- 8 bits
- Reversed
- 881
- Flips to (rotate 180°)
- 881
- Recamán's sequence
- a(1,395) = 188
- Square (n²)
- 35,344
- Cube (n³)
- 6,644,672
- Divisor count
- 6
- σ(n) — sum of divisors
- 336
- φ(n) — Euler's totient
- 92
- Sum of prime factors
- 51
Primality
Prime factorization: 2 2 × 47
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√188 = [13; (1, 2, 2, 6, 2, 2, 1, 26)]
Period length 8 — the block in parentheses repeats forever.
Representations
- In words
- one hundred eighty-eight
- Ordinal
- 188th
- Roman numeral
- CLXXXVIII
- Binary
- 10111100
- Octal
- 274
- Hexadecimal
- 0xBC
- Base64
- vA==
- One's complement
- 67 (8-bit)
- Scientific notation
- 1.88 × 10²
- As a duration
- 188 s = 3 minutes, 8 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ρπηʹ
- Mayan (base 20)
- 𝋩·𝋨
- Chinese
- 一百八十八
- Chinese (financial)
- 壹佰捌拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 188 = 9
- e — Euler's number (e)
- Digit 188 = 7
- φ — Golden ratio (φ)
- Digit 188 = 3
- √2 — Pythagoras's (√2)
- Digit 188 = 1
- ln 2 — Natural log of 2
- Digit 188 = 8
- γ — Euler-Mascheroni (γ)
- Digit 188 = 5
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 188, here are decompositions:
- 7 + 181 = 188
- 31 + 157 = 188
- 37 + 151 = 188
- 61 + 127 = 188
- 79 + 109 = 188
UTF-8 encoding: C2 BC (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.188.
- Address
- 0.0.0.188
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.0.188
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 188 Hz is closest to:
- Concert pitch (A4 = 440 Hz): F♯3 (185 Hz, +28¢)
- Scientific pitch (C4 = 256 Hz): G3 (191.8 Hz, -34¢)
- Baroque pitch (A4 = 415 Hz): G3 (184.9 Hz, +29¢)
Related reading
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.