904
904L is a highly alloyed austenitic stainless steel.
- Even
- Composite
Where 904 fits
Why 904 is special
It is expensive enough that its main consumer use is watch cases, where a manufacturer wanted a corrosion claim nobody else could make.
904 is part of
Factors & digit properties
- Divisors (8)
- 1, 2, 4, 8, 113, 226, 452, 904
- Prime factorisation
- 2^3 × 113
- Digit sum
- 13
- Digital root
- 4
Representations
- Decimal
- 904
- Scientific notation
- 9.040 × 10^2
Roman numerals
C M I V
CMIV uses the subtractive pair IV: one before five — five minus one.
Binary
1 1 1 0 0 0 1 0 0 0
1 × 512 + 1 × 256 + 1 × 128 + 0 × 64 + 0 × 32 + 0 × 16 + 1 × 8 + 0 × 4 + 0 × 2 + 0 × 1 = 904
Octal
1 6 1 0
1 × 512 + 6 × 64 + 1 × 8 + 0 × 1 = 904
Hexadecimal
3 8 8
3 × 256 + 8 × 16 + 8 × 1 = 904
Read as powers of two: 512 + 256 + 128 + 8 = 904.
In historical numeral systems
Egyptian
9 coils of rope, 4 strokes
9 × 100 + 4 × 1 = 904. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge + 5 vertical wedges (sixties place), 4 vertical wedges (units place)
15 × 60 + 4 = 904. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
sampi, then delta, marked as a numeral
sampi-delta + keraia
sampi + delta 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 tav, then qof, then dalet
tav-tav-qof-dalet
tav (400) + tav (400) + qof (100) + dalet (4) = 904, 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
- Happy number
Related numbers & connections
Higher nickel, molybdenum and copper extend acid resistance well beyond what 316 offers, at a cost that limits its use.
View 316 →Technology & computing
904L contains high nickel, chromium, molybdenum and copper for resistance to sulphuric acid. Its use in watch cases is a marketing application of an alloy developed for chemical plant.
DocumentedTechnology & computingGeography: International — AISI, SAE and Aluminium Association designations
Common questions
Is 904 a prime number?
No, 904 is not prime.
What are the factors of 904?
The factors of 904 are 1, 2, 4, 8, 113, 226, 452, 904.
What is 904 in Roman numerals?
904 in Roman numerals is CMIV. IV is subtractive: one before five — five minus one. Written additively it would be DCCCCIIII, 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