1967
1967 is the year of the first human heart transplant.
- Odd
- Composite
Where 1967 fits
Why 1967 is special
Christiaan Barnard's patient lived eighteen days. Transplantation only became routinely survivable after ciclosporin arrived in the 1980s, which is why the 1967 operation is a milestone in surgery rather than in treatment.
Same number, different meanings
How 1967 is understood across different contexts — never implying one meaning because of another.
- Mathematics
Christiaan Barnard's patient lived eighteen days. Transplantation only became routinely survivable after ciclosporin arrived in the 1980s, which is why the 1967 operation is a milestone in surgery rather than in treatment.
- Science
Barnard's first heart transplant patient survived eighteen days. Transplantation became routinely survivable only after ciclosporin in the 1980s, which is why 1967 is a milestone in surgical technique rather than in treatment.
- Technology & computing
In 1967, the first human heart transplant was performed in Cape Town (South Africa).
1967 is part of
Factors & digit properties
- Divisors (4)
- 1, 7, 281, 1967
- Prime factorisation
- 7 × 281
- Digit sum
- 23
- Digital root
- 5
Representations
- Decimal
- 1967
- Scientific notation
- 1.967 × 10^3
Roman numerals
M C M L X V I I
MCMLXVII uses the subtractive pair CM: a hundred before a thousand — a thousand minus a hundred.
Binary
1 1 1 1 0 1 0 1 1 1 1
1 × 1,024 + 1 × 512 + 1 × 256 + 1 × 128 + 0 × 64 + 1 × 32 + 0 × 16 + 1 × 8 + 1 × 4 + 1 × 2 + 1 × 1 = 1,967
Octal
3 6 5 7
3 × 512 + 6 × 64 + 5 × 8 + 7 × 1 = 1,967
Hexadecimal
7 a f
7 × 256 + a × 16 + f × 1 = 1,967
Read as powers of two: 1,024 + 512 + 256 + 128 + 32 + 8 + 4 + 2 + 1 = 1,967.
In historical numeral systems
Egyptian
1 lotus, 9 coils of rope, 6 hobbles, 7 strokes
1 × 1,000 + 9 × 100 + 6 × 10 + 7 × 1 = 1,967. 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), 4 corner wedges + 7 vertical wedges (units place)
32 × 60 + 47 = 1967. 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
- Happy number
- Semiprime
Related numbers & connections
1967 is a year in the 20th century, in the 1960s.
The first heart transplant in 1967 and the first IVF birth in 1978 were both condemned before they worked and became routine afterwards.
View 1978 →Science
Barnard's first heart transplant patient survived eighteen days. Transplantation became routinely survivable only after ciclosporin in the 1980s, which is why 1967 is a milestone in surgical technique rather than in treatment.
DocumentedScienceGeography: South AfricaPeriod: 1967
Technology & computing
In 1967, the first human heart transplant was performed in Cape Town (South Africa).
DocumentedTechnology & computingGeography: South AfricaPeriod: 1967
Common questions
Is 1967 a prime number?
No, 1967 is not prime.
What are the factors of 1967?
The factors of 1967 are 1, 7, 281, 1967.
What is 1967 in Roman numerals?
1967 in Roman numerals is MCMLXVII. CM is subtractive: a hundred before a thousand — a thousand minus a hundred. Written additively it would be MDCCCCLXVII, 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