Number

142

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

Arithmetic Number Deficient Number Evil Number Recamán's Sequence Semiprime Squarefree Year

Historical context — 142 AD

Calendar year

Year 142 (CXLII) was a common year starting on Sunday of the Julian calendar.

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Historical context — 142 BC

Calendar year

Year 142 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: Common year
Standard 365-day year; not divisible by 4 (or divisible by 100 but not 400).
Days in year: 365
ISO weeks: 52
Started on: Monday
January 1, 142
Ended on: Monday
December 31, 142
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 140s
140–149
Century: 2nd century
101–200
Millennium: 1st millennium
1–1000
Years ago: 1,884
1884 years before 2026.

In other calendars

Hebrew: 3902 / 3903 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Water zodiac:Horse
Sexagenary cycle position 19 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 685 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 134 / 135 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 64 / 63 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: 8 bits
Reversed: 241
Recamán's sequence: a(748) = 142
Square (n²): 20,164
Cube (n³): 2,863,288
Divisor count: 4
σ(n) — sum of divisors: 216
φ(n) — Euler's totient: 70
Sum of prime factors: 73

Primality

Prime factorization: 2 × 71

Nearest primes: 139 (−3) · 149 (+7)

Divisors & multiples

All divisors (4)

1 · 2 · 71 (half) · 142

Aliquot sum (sum of proper divisors): 74

Factor pairs (a × b = 142)

1 × 142

2 × 71

First multiples

142 · 284 (double) · 426 · 568 · 710 · 852 · 994 · 1,136 · 1,278 · 1,420

Sums & aliquot sequence

As consecutive integers: 34 + 35 + 36 + 37

Aliquot sequence: 142 → 74 → 40 → 50 → 43 → 1 → 0 — terminates at zero

Representations

In words: one hundred forty-two
Ordinal: 142nd
Roman numeral: CXLII
Binary: 10001110
Octal: 216
Hexadecimal: 0x8E
Base64: jg==
One's complement: 113 (8-bit)

In other bases

ternary (3) 12021

quaternary (4) 2032

quinary (5) 1032

senary (6) 354

septenary (7) 262

nonary (9) 167

undecimal (11) 11a

duodecimal (12) ba

tridecimal (13) ac

tetradecimal (14) a2

pentadecimal (15) 97

Historical numeral systems

Babylonian (base 60): 𒁹𒁹 𒌋𒌋𒁹𒁹
Egyptian hieroglyphic: 𓍢𓎆𓎆𓎆𓎆𓏺𓏺
Greek (Milesian): ρμβʹ
Mayan (base 20): 𝋧·𝋢
Chinese: 一百四十二
Chinese (financial): 壹佰肆拾貳

In other modern scripts

Eastern Arabic ١٤٢ Devanagari १४२ Bengali ১৪২ Tamil ௧௪௨ Thai ๑๔๒ Tibetan ༡༤༢ Khmer ១៤២ Lao ໑໔໒ Burmese ၁၄၂

Digit at this position in famous constants

π — Pi (π): Digit 142 = 5
e — Euler's number (e): Digit 142 = 0
φ — Golden ratio (φ): Digit 142 = 3
√2 — Pythagoras's (√2): Digit 142 = 4
ln 2 — Natural log of 2: Digit 142 = 2
γ — Euler-Mascheroni (γ): Digit 142 = 4

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 142, here are decompositions:

3 + 139 = 142
5 + 137 = 142
11 + 131 = 142
29 + 113 = 142
41 + 101 = 142
53 + 89 = 142
59 + 83 = 142
71 + 71 = 142

Showing the first eight; more decompositions exist.

Unicode codepoint

Single Shift Two

U+008E

Control character (Cc)

UTF-8 encoding: C2 8E (2 bytes).

Lookup U+008E on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#00008E

RGB(0, 0, 142)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.142.

Address: 0.0.0.142
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.142

Unspecified address (0.0.0.0/8) — "this network" placeholder.