852
+852 is the international calling code for Hong Kong.
- Even
- Composite
Where 852 fits
Why 852 is special
Hong Kong kept its own calling code after the 1997 transfer of sovereignty, as it kept its own currency and legal system. Calls between Hong Kong and mainland China are dialled internationally despite being within one country.
Factors & digit properties
- Divisors (12)
- 1, 2, 3, 4, 6, 12, 71, 142, 213, 284, 426, 852
- Prime factorisation
- 2^2 × 3 × 71
- Digit sum
- 15
- Digital root
- 6
Representations
- Decimal
- 852
- Binary
- 1101010100
- Octal
- 1524
- Hexadecimal
- 354
- Roman numeral
- DCCCLII
- Scientific notation
- 8.520 × 10^2
Other mathematical patterns
- Abundant number
- Pentagonal number
Related numbers & connections
Hong Kong kept +852 after the 1997 transfer of sovereignty, as it kept its currency and legal system, so calls to mainland China's +86 are dialled internationally within one country.
View 86 →Geography
+852 reaches Hong Kong, which kept its own code after the 1997 transfer of sovereignty just as it kept its currency and legal system. Calls between Hong Kong and mainland China are dialled internationally.
DocumentedGeographyGeography: Hong Kong
Common questions
Is 852 a prime number?
No, 852 is not prime.
What are the factors of 852?
The factors of 852 are 1, 2, 3, 4, 6, 12, 71, 142, 213, 284, 426, 852.
What is 852 in Roman numerals?
852 in Roman numerals is DCCCLII.
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