124
124 is a composite number, even, a calendar year.
124 (one hundred twenty-four) is an even 3-digit number. It is a composite number with 6 divisors, and factors as 2² × 31. Written other ways, in Roman numerals it is CXXIV and in binary, 1111100.
Interestingness
Historical context — 124 AD
Calendar year
Year 124 (CXXIV) was a leap year starting on Friday of the Julian calendar.
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Historical context — 124 BC
Calendar year
Year 124 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
-
Saturday
January 1, 124
- Ended on
-
Sunday
December 31, 124
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
120s
120–129
- Century
-
2nd century
101–200
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,902
1902 years before 2026.
In other calendars
- Hebrew
-
3884 / 3885 AM
Rosh Hashanah falls in September/October.
- Chinese
-
Year of the zodiac:Wood zodiac:Rat
Sexagenary cycle position 1 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
667 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
116 / 117 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
46 / 45 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 2 × 31
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√124 = [11; (7, 2, 1, 1, 1, 3, 1, 4, 1, 3, 1, 1, 1, 2, 7, 22)]
Period length 16 — the block in parentheses repeats forever.
Representations
- In words
- one hundred twenty-four
- Ordinal
- 124th
- Roman numeral
- CXXIV
- Binary
- 1111100
- Octal
- 174
- Hexadecimal
- 0x7C
- Base64
- fA==
- One's complement
- 131 (8-bit)
- Scientific notation
- 1.24 × 10²
- As a duration
- 124 s = 2 minutes, 4 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹 𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓎆𓎆𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ρκδʹ
- Mayan (base 20)
- 𝋦·𝋤
- Chinese
- 一百二十四
- Chinese (financial)
- 壹佰貳拾肆
Digit at this position in famous constants
- π — Pi (π)
- Digit 124 = 3
- e — Euler's number (e)
- Digit 124 = 7
- φ — Golden ratio (φ)
- Digit 124 = 6
- √2 — Pythagoras's (√2)
- Digit 124 = 4
- ln 2 — Natural log of 2
- Digit 124 = 5
- γ — Euler-Mascheroni (γ)
- Digit 124 = 0
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 124, here are decompositions:
- 11 + 113 = 124
- 17 + 107 = 124
- 23 + 101 = 124
- 41 + 83 = 124
- 53 + 71 = 124
As an ASCII codepoint, 124 is |. Printable ASCII character |.
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.124.
- Address
- 0.0.0.124
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.0.124
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 124 Hz is closest to:
- Concert pitch (A4 = 440 Hz): B2 (123.5 Hz, +7¢)
- Scientific pitch (C4 = 256 Hz): B2 (120.8 Hz, +45¢ — about midway to C3)
- Baroque pitch (A4 = 415 Hz): C3 (123.4 Hz, +9¢)
As a MIDI note number, 124 is E9 (10548.1 Hz at concert pitch).
On an ingredients label, E124 is Ponceau 4R, a food colour.
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.