74,138
The 74138 is a three-to-eight line decoder.
- Even
- Composite
Where 74,138 fits
Why 74,138 is special
It turns three address lines into eight chip-select signals, which is how a computer with one bus decides which memory or peripheral is being addressed.
74,138 is part of
Factors & digit properties
- Divisors (8)
- 1, 2, 19, 38, 1951, 3902, 37069, 74138
- Prime factorisation
- 2 × 19 × 1951
- Digit sum
- 23
- Digital root
- 5
Representations
- Decimal
- 74138
- Binary
- 10010000110011010
- Octal
- 220632
- Hexadecimal
- 1219a
- Scientific notation
- 7.414 × 10^4
Other mathematical patterns
- Deficient number
- Happy number
Related numbers & connections
One expands a few pins into many outputs and the other narrows many address lines into one selection, which are opposite jobs on the same bus.
View 74595 →Technology & computing
The 74138 decodes three binary inputs to one of eight active-low outputs with three enable inputs. It is the standard address-decoding part in memory-mapped systems.
DocumentedTechnology & computingPeriod: 1970s–
Common questions
Is 74,138 a prime number?
No, 74,138 is not prime.
What are the factors of 74,138?
The factors of 74,138 are 1, 2, 19, 38, 1951, 3902, 37069, 74138.
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: 3 August 2026