1977
1977 is the year the Apple II shipped and the Voyager probes launched.
- Odd
- Composite
Where 1977 fits
Why 1977 is special
The Apple II brought colour graphics and expansion slots to a consumer machine. Voyager 1 and 2 are still transmitting from interstellar space nearly fifty years later, running on computers far weaker than the Apple II.
1977 connects to:
- 1981 — appears alongside
- historical years — appears in
Same number, different meanings
How 1977 is understood across different contexts — never implying one meaning because of another.
- Mathematics
The Apple II brought colour graphics and expansion slots to a consumer machine. Voyager 1 and 2 are still transmitting from interstellar space nearly fifty years later, running on computers far weaker than the Apple II.
- History
In 1977, the Voyager probes were launched, and Apple II and Atari 2600 helped open home computing.
- Science
Voyager 1 and 2 launched in 1977 and are still sending data from interstellar space, running computers far less capable than the Apple II that shipped the same year. Nothing else built in 1977 is still operating at that distance.
1977 is part of
Factors & digit properties
- Divisors (4)
- 1, 3, 659, 1977
- Prime factorisation
- 3 × 659
- Digit sum
- 24
- Digital root
- 6
Representations
- Decimal
- 1977
- Scientific notation
- 1.977 × 10^3
Roman numerals
M C M L X X V I I
MCMLXXVII uses the subtractive pair CM: a hundred before a thousand — a thousand minus a hundred.
Binary
1 1 1 1 0 1 1 1 0 0 1
1 × 1,024 + 1 × 512 + 1 × 256 + 1 × 128 + 0 × 64 + 1 × 32 + 1 × 16 + 1 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 1,977
Octal
3 6 7 1
3 × 512 + 6 × 64 + 7 × 8 + 1 × 1 = 1,977
Hexadecimal
7 b 9
7 × 256 + b × 16 + 9 × 1 = 1,977
Read as powers of two: 1,024 + 512 + 256 + 128 + 32 + 16 + 8 + 1 = 1,977.
In historical numeral systems
Egyptian
1 lotus, 9 coils of rope, 7 hobbles, 7 strokes
1 × 1,000 + 9 × 100 + 7 × 10 + 7 × 1 = 1,977. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
3 corner wedges + 2 vertical wedges (sixties place), 5 corner wedges + 7 vertical wedges (units place)
32 × 60 + 57 = 1977. Places are separated by a space on the tablet, with the higher place written first.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
Other mathematical patterns
- Deficient number
- Semiprime
- Lucky number (mathematical sieve)
Related numbers & connections
The Apple II and the IBM PC, four years apart. The first proved there was a home market and the second made it an industry with interchangeable parts.
View 1981 →Numbers Around Us
- appears alongside1981
why?
Strength 0.50, confidence "high".
- appears inHistorical years
why?
Strength 0.50, confidence "high".
History
In 1977, the Voyager probes were launched, and Apple II and Atari 2600 helped open home computing.
DocumentedHistoryGeography: globalPeriod: 1977
Science
Voyager 1 and 2 launched in 1977 and are still sending data from interstellar space, running computers far less capable than the Apple II that shipped the same year. Nothing else built in 1977 is still operating at that distance.
DocumentedSciencePeriod: 1977
Common questions
Is 1977 a prime number?
No, 1977 is not prime.
What are the factors of 1977?
The factors of 1977 are 1, 3, 659, 1977.
What is 1977 in Roman numerals?
1977 in Roman numerals is MCMLXXVII. CM is subtractive: a hundred before a thousand — a thousand minus a hundred. Written additively it would be MDCCCCLXXVII, which Roman inscriptions used freely — the strict subtractive form is a later convention.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026