340
The Airbus A340 has four engines and was outlived by its twin-engined sibling.
- Even
- Composite
Where 340 fits
Why 340 is special
It was designed when regulations restricted twins over oceans. Those rules relaxed and fuel prices rose, so the A330 it was developed alongside remained in production long after the A340 stopped.
Factors & digit properties
- Divisors (12)
- 1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 170, 340
- Prime factorisation
- 2^2 × 5 × 17
- Digit sum
- 7
- Digital root
- 7
Representations
- Decimal
- 340
- Scientific notation
- 3.400 × 10^2
Roman numerals
C C C X L
CCCXL uses the subtractive pair XL: ten before fifty — fifty minus ten.
Binary
1 0 1 0 1 0 1 0 0
1 × 256 + 0 × 128 + 1 × 64 + 0 × 32 + 1 × 16 + 0 × 8 + 1 × 4 + 0 × 2 + 0 × 1 = 340
Octal
5 2 4
5 × 64 + 2 × 8 + 4 × 1 = 340
Hexadecimal
1 5 4
1 × 256 + 5 × 16 + 4 × 1 = 340
Read as powers of two: 256 + 64 + 16 + 4 = 340.
In historical numeral systems
Egyptian
3 coils of rope, 4 hobbles
3 × 100 + 4 × 10 = 340. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
5 vertical wedges (sixties place), 4 corner wedges (units place)
5 × 60 + 40 = 340. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
tau, then mu, marked as a numeral
tau-mu + keraia
tau + mu written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
shin, then mem
shin-mem
shin (300) + mem (40) = 340, written in descending order.
Maya
3 bars + 2 dots (upper, twenties place) over shell (zero) (lower, units place)
17 × 20 + 0 = 340. Places stack vertically with the smallest at the bottom, so the upper group is worth twenty times the lower.
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
- Abundant number
Related numbers & connections
The A340 has four engines and the A350 two. Relaxed over-water rules and fuel cost made the four-engine layout obsolete rather than any deficiency in the aircraft.
View 350 →Other connections
- contrasts with350
why?
Strength 0.50, confidence "high".
Technology & computing
There are about 340 × 10³⁶ addresses in the IPv6 address space (worldwide, internet addressing). Exactly 2¹²⁸, a 39-digit number. It is almost always written as a power, because the digits carry no information a reader can hold.
DocumentedTechnology & computingGeography: worldwide, internet addressingThe A340 was built for a regulatory world that required more than two engines over water. When that requirement relaxed the aircraft's whole rationale went with it.
DocumentedTechnology & computing
Common questions
Is 340 a prime number?
No, 340 is not prime.
What are the factors of 340?
The factors of 340 are 1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 170, 340.
What is 340 in Roman numerals?
340 in Roman numerals is CCCXL. XL is subtractive: ten before fifty — fifty minus ten. Written additively it would be CCCXXXX, 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