749
The Lockheed Constellation 749 flew the first around-the-world commercial service.
- Odd
- Composite
Where 749 fits
Why 749 is special
Its distinctive triple tail existed for a practical reason: a single fin tall enough would not fit in existing hangars.
Factors & digit properties
- Divisors (4)
- 1, 7, 107, 749
- Prime factorisation
- 7 × 107
- Digit sum
- 20
- Digital root
- 2
Representations
- Decimal
- 749
- Scientific notation
- 7.490 × 10^2
Roman numerals
D C C X L I X
DCCXLIX uses the subtractive pair IX: one before ten — ten minus one.
Binary
1 0 1 1 1 0 1 1 0 1
1 × 512 + 0 × 256 + 1 × 128 + 1 × 64 + 1 × 32 + 0 × 16 + 1 × 8 + 1 × 4 + 0 × 2 + 1 × 1 = 749
Octal
1 3 5 5
1 × 512 + 3 × 64 + 5 × 8 + 5 × 1 = 749
Hexadecimal
2 e d
2 × 256 + e × 16 + d × 1 = 749
Read as powers of two: 512 + 128 + 64 + 32 + 8 + 4 + 1 = 749.
In historical numeral systems
Egyptian
7 coils of rope, 4 hobbles, 9 strokes
7 × 100 + 4 × 10 + 9 × 1 = 749. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge + 2 vertical wedges (sixties place), 2 corner wedges + 9 vertical wedges (units place)
12 × 60 + 29 = 749. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
psi, then mu, then theta, marked as a numeral
psi-mu-theta + keraia
psi + mu + theta written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
tav, then shin, then mem, then tet
tav-shin-mem-tet
tav (400) + shin (300) + mem (40) + tet (9) = 749, written in descending order.
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
Related numbers & connections
The Constellation took over the ocean routes the flying boats had opened, once runways were long enough.
View 314 →Other connections
- is associated with314
why?
Strength 0.50, confidence "high".
Technology & computing
The Lockheed L-749 Constellation entered service in 1947 with increased range, allowing Pan American to begin round-the-world service. The triple tail kept overall height within existing hangar clearances.
DocumentedTechnology & computingGeography: United StatesPeriod: 1947–
Common questions
Is 749 a prime number?
No, 749 is not prime.
What are the factors of 749?
The factors of 749 are 1, 7, 107, 749.
What is 749 in Roman numerals?
749 in Roman numerals is DCCXLIX. IX is subtractive: one before ten — ten minus one. Written additively it would be DCCXXXXVIIII, 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: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 15 July 2026