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Number

388

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

Deficient Number Odious Number Pernicious Number Recamán's Sequence Year

Historical context — 388 AD

Calendar year

Year 388 (CCCLXXXVIII) was a leap year starting on Saturday of the Julian calendar.

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

Historical context — 388 BC

Calendar year

Year 388 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
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

Parity
Even
Digit count
3
Digit sum
19
Digit product
192
Digital root
1
Palindrome
No
Bit width
9 bits
Reversed
883
Recamán's sequence
a(2,476) = 388
Square (n²)
150,544
Cube (n³)
58,411,072
Divisor count
6
σ(n) — sum of divisors
686
φ(n) — Euler's totient
192
Sum of prime factors
101

Primality

Prime factorization: 2 2 × 97

Nearest primes: 383 (−5) · 389 (+1)

Divisors & multiples

All divisors (6)
1 · 2 · 4 · 97 · 194 (half) · 388
Aliquot sum (sum of proper divisors): 298
Factor pairs (a × b = 388)
1 × 388
2 × 194
4 × 97
First multiples
388 · 776 (double) · 1,164 · 1,552 · 1,940 · 2,328 · 2,716 · 3,104 · 3,492 · 3,880

Sums & aliquot sequence

As a sum of two squares: 8² + 18²
As consecutive integers: 45 + 46 + … + 52
Aliquot sequence: 388 → 298 → 152 → 148 → 118 → 62 → 34 → 20 → 22 → 14 → 10 → 8 → 7 → 1 → 0 — terminates at zero

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)
In other bases
ternary (3) 112101
quaternary (4) 12010
quinary (5) 3023
senary (6) 1444
septenary (7) 1063
nonary (9) 471
undecimal (11) 323
duodecimal (12) 284
tridecimal (13) 23b
tetradecimal (14) 1da
pentadecimal (15) 1ad

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
In other modern scripts
Eastern Arabic ٣٨٨ Devanagari ३८८ Bengali ৩৮৮ Tamil ௩௮௮ Thai ๓๘๘ Tibetan ༣༨༨ Khmer ៣៨៨ Lao ໓໘໘ Burmese ၃၈၈

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 decomposition

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.

Unicode codepoint
Ƅ
Latin Capital Letter Tone Six
U+0184
Uppercase letter (Lu)

UTF-8 encoding: C6 84 (2 bytes).

Lookup U+0184 on Compart ↗ Lookup on FileFormat.Info ↗
Hex color
#000184
RGB(0, 1, 132)
IPv4 address

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.