94
94 is the atomic number of plutonium, whose isotope Pu-239 was the fissile material in the atomic bomb dropped on Nagasaki in 1945.
- Even
- Composite
Where 94 fits
Why 94 is special
94's element carries the same weight of 20th-century history as uranium (92), from the opposite side of the same story.
Same number, different meanings
How 94 is understood across different contexts — never implying one meaning because of another.
- Mathematics
94's element carries the same weight of 20th-century history as uranium (92), from the opposite side of the same story.
- Technology & computing
CWE-94 is code injection: input incorporated into something the runtime will interpret. It differs from command injection in that the target is the application's own language rather than a shell.
- History
Plutonium's isotope Pu-239 was the fissile material used in the atomic bomb dropped on Nagasaki in 1945.
- Science
94 is the atomic number of plutonium. Beyond its role in nuclear weapons and reactors, plutonium-238 supplies steady heat and power to spacecraft too far from the Sun for solar panels, including the Voyager probes.
94 is part of
Factors & digit properties
- Divisors (4)
- 1, 2, 47, 94
- Prime factorisation
- 2 × 47
- Digit sum
- 13
- Digital root
- 4
Representations
- Decimal
- 94
- Scientific notation
- 9.400 × 10^1
Roman numerals
X C I V
XCIV uses the subtractive pair IV: one before five — five minus one.
Binary
1 0 1 1 1 1 0
1 × 64 + 0 × 32 + 1 × 16 + 1 × 8 + 1 × 4 + 1 × 2 + 0 × 1 = 94
Octal
1 3 6
1 × 64 + 3 × 8 + 6 × 1 = 94
Hexadecimal
5 e
5 × 16 + e × 1 = 94
Read as powers of two: 64 + 16 + 8 + 4 + 2 = 94.
In historical numeral systems
Egyptian
9 hobbles, 4 strokes
9 × 10 + 4 × 1 = 94. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 vertical wedge (sixties place), 3 corner wedges + 4 vertical wedges (units place)
1 × 60 + 34 = 94. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
koppa, then delta, marked as a numeral
koppa-delta + keraia
koppa + delta written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
tsadi, then dalet
tsadi-dalet
tsadi (90) + dalet (4) = 94, written in descending order.
Chinese numerals
jiǔ shí sì
jiǔ shí sì
九 before 十 multiplies it: 9 tens. 四 after it adds 4. The written form mirrors the arithmetic — "jiǔ shí sì". The financial (anti-fraud) form is 玖拾肆.
Maya
4 dots (upper, twenties place) over 2 bars + 4 dots (lower, units place)
4 × 20 + 14 = 94. 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
- Deficient number
- Happy number
- Semiprime
Related numbers & connections
47 is a factor of 94 (47 × 2 = 94).
View 47 →Dynamically managed code resources are the general class of which code injection is one instance.
View 913 →Technology & computing
CWE-94 is code injection: input incorporated into something the runtime will interpret. It differs from command injection in that the target is the application's own language rather than a shell.
DocumentedTechnology & computingGeography: International — MITRE CWEPeriod: 2006–
History
Plutonium's isotope Pu-239 was the fissile material used in the atomic bomb dropped on Nagasaki in 1945.
DocumentedHistoryPeriod: 1945
Science
94 is the atomic number of plutonium. Beyond its role in nuclear weapons and reactors, plutonium-238 supplies steady heat and power to spacecraft too far from the Sun for solar panels, including the Voyager probes.
DocumentedScience
Common questions
Why do deep-space probes carry plutonium?
Because sunlight is too weak that far out for solar panels. Plutonium-238 gives off steady heat as it decays, and a thermoelectric generator turns that into electricity with no moving parts. It is not the same isotope used in weapons, and it is what has kept the Voyager probes transmitting since 1977.
Is the plutonium in spacecraft the same as in weapons?
No. Weapons use plutonium-239, which is fissile. Spacecraft carry plutonium-238, which is not — it simply gives off steady heat as it decays, and a thermoelectric generator turns that into electricity with no moving parts. That is what has kept the Voyager probes transmitting since 1977, far beyond any range solar panels could work at.
Is 94 a prime number?
No, 94 is not prime.
What are the factors of 94?
The factors of 94 are 1, 2, 47, 94.
What is 94 in Roman numerals?
94 in Roman numerals is XCIV. IV is subtractive: one before five — five minus one. Written additively it would be LXXXXIIII, 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: 3 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026