433
433 Eros was the first asteroid orbited and landed on by a spacecraft.
- Odd
- Prime
Where 433 fits
Why 433 is special
NEAR Shoemaker was not designed to land and was set down anyway at the end of its mission in 2001, transmitting from the surface for over two weeks afterwards.
433 is part of
Factors & digit properties
- Divisors (2)
- 1, 433
- Prime factorisation
- 433
- Digit sum
- 10
- Digital root
- 1
Representations
- Decimal
- 433
- Scientific notation
- 4.330 × 10^2
Roman numerals
C D X X X I I I
CDXXXIII uses the subtractive pair CD: a hundred before five hundred — five hundred minus a hundred.
Binary
1 1 0 1 1 0 0 0 1
1 × 256 + 1 × 128 + 0 × 64 + 1 × 32 + 1 × 16 + 0 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 433
Octal
6 6 1
6 × 64 + 6 × 8 + 1 × 1 = 433
Hexadecimal
1 b 1
1 × 256 + b × 16 + 1 × 1 = 433
Read as powers of two: 256 + 128 + 32 + 16 + 1 = 433.
In historical numeral systems
Egyptian
4 coils of rope, 3 hobbles, 3 strokes
4 × 100 + 3 × 10 + 3 × 1 = 433. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
7 vertical wedges (sixties place), 1 corner wedge + 3 vertical wedges (units place)
7 × 60 + 13 = 433. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
upsilon, then lambda, then gamma, marked as a numeral
upsilon-lambda-gamma + keraia
upsilon + lambda + gamma 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 lamed, then gimel
tav-lamed-gimel
tav (400) + lamed (30) + gimel (3) = 433, 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
- Lucky number (mathematical sieve)
- Twin prime
Related numbers & connections
Gaspra was the first asteroid photographed close up, six years before Eros became the first orbited and landed on.
View 951 →Science
NEAR Shoemaker orbited Eros for a year and was then deliberately brought down onto it in 2001, despite having no landing system. It kept transmitting from the surface for more than a fortnight.
DocumentedScience
Common questions
Is 433 a prime number?
Yes, 433 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 433?
The factors of 433 are 1, 433.
What is 433 in Roman numerals?
433 in Roman numerals is CDXXXIII. CD is subtractive: a hundred before five hundred — five hundred minus a hundred. Written additively it would be CCCCXXXIII, 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