388
388 is a composite number, even, a calendar year.
388 (three hundred eighty-eight) is an even 3-digit number. It is a composite number with 6 divisors, and factors as 2² × 97. Written other ways, in Roman numerals it is CCCLXXXVIII and in binary, 110000100.
Interestingness
Historical context — 388 AD
Calendar year
Year 388 (CCCLXXXVIII) was a leap year starting on Saturday of the Julian calendar.
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Historical context — 388 BC
Calendar year
Year 388 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
-
Friday
January 1, 388
- Ended on
-
Saturday
December 31, 388
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
380s
380–389
- Century
-
4th century
301–400
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,638
1638 years before 2026.
In other calendars
- Hebrew
-
4148 / 4149 AM
Rosh Hashanah falls in September/October.
- Chinese
-
Year of the zodiac:Earth zodiac:Rat
Sexagenary cycle position 25 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
931 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
380 / 381 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
310 / 309 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 2 × 97
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√388 = [19; (1, 2, 3, 4, 12, 1, 8, 1, 12, 4, 3, 2, 1, 38)]
Period length 14 — the block in parentheses repeats forever.
Representations
- In words
- three hundred eighty-eight
- Ordinal
- 388th
- Roman numeral
- CCCLXXXVIII
- Binary
- 110000100
- Octal
- 604
- Hexadecimal
- 0x184
- Base64
- AYQ=
- One's complement
- 65,147 (16-bit)
- Scientific notation
- 3.88 × 10²
- As a duration
- 388 s = 6 minutes, 28 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- τπηʹ
- Mayan (base 20)
- 𝋳·𝋨
- Chinese
- 三百八十八
- Chinese (financial)
- 參佰捌拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 388 = 6
- e — Euler's number (e)
- Digit 388 = 6
- φ — Golden ratio (φ)
- Digit 388 = 5
- √2 — Pythagoras's (√2)
- Digit 388 = 4
- ln 2 — Natural log of 2
- Digit 388 = 3
- γ — Euler-Mascheroni (γ)
- Digit 388 = 2
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 388, here are decompositions:
- 5 + 383 = 388
- 29 + 359 = 388
- 41 + 347 = 388
- 71 + 317 = 388
- 107 + 281 = 388
- 131 + 257 = 388
- 137 + 251 = 388
- 149 + 239 = 388
Showing the first eight; more decompositions exist.
UTF-8 encoding: C6 84 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.132.
- Address
- 0.0.1.132
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.1.132
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 388 Hz is closest to:
- Concert pitch (A4 = 440 Hz): G4 (392 Hz, -18¢)
- Scientific pitch (C4 = 256 Hz): G4 (383.6 Hz, +20¢)
- Baroque pitch (A4 = 415 Hz): G♯4 (391.7 Hz, -16¢)
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.