Number

124

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

Ascending Digits Deficient Number Odious Number Pernicious Number Recamán's Sequence Year

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

Parity: Even
Digit count: 3
Digit sum: 7
Digit product: 8
Digital root: 7
Palindrome: No
Bit width: 7 bits
Reversed: 421
Recamán's sequence: a(152) = 124
Square (n²): 15,376
Cube (n³): 1,906,624
Divisor count: 6
σ(n) — sum of divisors: 224
φ(n) — Euler's totient: 60
Sum of prime factors: 35

Primality

Prime factorization: 2 ² × 31

Nearest primes: 113 (−11) · 127 (+3)

Divisors & multiples

All divisors (6)

1 · 2 · 4 · 31 · 62 (half) · 124

Aliquot sum (sum of proper divisors): 100

Factor pairs (a × b = 124)

1 × 124

2 × 62

4 × 31

First multiples

124 · 248 (double) · 372 · 496 · 620 · 744 · 868 · 992 · 1,116 · 1,240

Sums & aliquot sequence

As consecutive integers: 12 + 13 + … + 19

Aliquot sequence: 124 → 100 → 117 → 65 → 19 → 1 → 0 — terminates at zero

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)

In other bases

ternary (3) 11121

quaternary (4) 1330

quinary (5) 444

senary (6) 324

septenary (7) 235

nonary (9) 147

undecimal (11) 103

duodecimal (12) a4

tridecimal (13) 97

tetradecimal (14) 8c

pentadecimal (15) 84

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

In other modern scripts

Eastern Arabic ١٢٤ Devanagari १२४ Bengali ১২৪ Tamil ௧௨௪ Thai ๑๒๔ Tibetan ༡༢༤ Khmer ១២៤ Lao ໑໒໔ Burmese ၁၂၄

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 decomposition

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

ASCII character

As an ASCII codepoint, 124 is |. Printable ASCII character |.

Hex color

#00007C

RGB(0, 0, 124)

IPv4 address

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.