7500
Squawk 7500 is the transponder code for hijacking.
- Even
- Composite
Where 7500 fits
Why 7500 is special
A pilot sets it silently and every radar screen in range shows the aircraft as hijacked without a word being spoken. The three emergency codes are deliberately far apart on the dial so none can be reached by accidentally rotating a knob past another.
Factors & digit properties
- Divisors (30)
- 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 25, 30, 50, 60, 75, 100, 125, 150, 250, 300, 375, 500, 625, 750, 1250, 1500, 1875, 2500, 3750, 7500
- Prime factorisation
- 2^2 × 3 × 5^4
- Digit sum
- 12
- Digital root
- 3
Representations
- Decimal
- 7500
- Scientific notation
- 7.500 × 10^3
Roman numerals
Roman numerals as modelled here goes up to 3,999.
Binary
1 1 1 0 1 0 1 0 0 1 1 0 0
1 × 4,096 + 1 × 2,048 + 1 × 1,024 + 0 × 512 + 1 × 256 + 0 × 128 + 1 × 64 + 0 × 32 + 0 × 16 + 1 × 8 + 1 × 4 + 0 × 2 + 0 × 1 = 7,500
Octal
1 6 5 1 4
1 × 4,096 + 6 × 512 + 5 × 64 + 1 × 8 + 4 × 1 = 7,500
Hexadecimal
1 d 4 c
1 × 4,096 + d × 256 + 4 × 16 + c × 1 = 7,500
Read as powers of two: 4,096 + 2,048 + 1,024 + 256 + 64 + 8 + 4 = 7,500.
In historical numeral systems
Egyptian
7 lotuses, 5 coils of rope
7 × 1,000 + 5 × 100 = 7,500. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
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
- Harshad (Niven) number
Related numbers & connections
Two of the three transponder emergency codes. They are spaced far apart on the dial specifically so one cannot be reached by accidentally turning past another.
View 7600 →Numbers Around Us
- appears alongside7600
why?
Strength 0.50, confidence "high".
Law & regulation
Squawk 7500 marks an aircraft as hijacked on every radar screen in range without a word being spoken. The three emergency codes are spaced far apart on the dial specifically so none can be reached by accidentally turning a knob past another.
DocumentedLaw & regulationGeography: International civil aviation
Common questions
Is 7500 a prime number?
No, 7500 is not prime.
What are the factors of 7500?
The factors of 7500 are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 25, 30, 50, 60, 75, 100, 125, 150, 250, 300, 375, 500, 625, 750, 1250, 1500, 1875, 2500, 3750, 7500.
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