| Nominal | 9840 |
| Cardinal | nine thousand eight hundred forty |
Cardinal nine thousand eight hundred forty | |
| Ordinal | 9,840th |
| Number of digits | 4 |
| Sum of digits | 21 |
| Product of digits | 0 |
| Number parity | Even |
| Prime factorization | 2 x 2 x 2 x 2 x 3 x 5 x 41 |
| Prime factorization in exponent form | 24 x 3 x 5 x 41 |
| Prime factors | 2, 3, 5, 41 |
| Number of distinct prime factors ω(n) | 4 |
| Total number of prime factors Ω(n) | 7 |
| Sum of prime factors | 51 |
| Product of prime factors | 1230 |
| Is 9840 a prime number? | No |
| Is 9840 a semiprime number? | No |
| Is 9840 a Chen prime number? | No |
| Is 9840 a Mersenne prime number? | No |
| Is 9840 a Catalan number? | No |
| Is 9840 a Fibonacci number? | No |
| Is 9840 a Idoneal number? | No |
| Square of 9840 (n2) | 96825600 |
| Cube of 9840 (n3) | 952763904000 |
| Square root of 9840 | 99.196774141098 |
| Natural Logarithm (ln) of 9840 | 9.1942109900463 |
| Decimal Logarithm (log) of 9840 | 3.9929950984313 |
| Sine of 9840 | 0.50709329390857 |
| Cosecant of 9840 | 1.9720237124262 |
| Cosine of 9840 | 0.86189117136269 |
| Secant of 9840 | 1.1602392891657 |
| Tangent of 9840 | 0.58834956286515 |
| Cotangent of 9840 | 1.699669827458 |
| The spelling of 9840 in words is "nine thousand eight hundred forty", meaning that: |
| 9840 is not an aban number (as it contains the letter a) |
| 9840 is not an eban number (as it contains the letter e) |
| 9840 is not an iban number (as it contains the letter i) |
| 9840 is not an oban number (as it contains the letter o) |
| 9840 is not a tban number (as it contains the letter t) |
| 9840 is not an uban number (as it contains the letter u) |
| Bengali numerals | ৯৮৪০ |
| Eastern Arabic numerals | ٩٬٨٤٠ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍩𓎉 |
| Khmer numerals | ៩៨៤០ |
| Japanese numerals | 九千八百四十 |
| Roman numerals | n/a |
| Thai numerals | ๙๘๔๐ |
| Arabic | تسعة آلاف و ثمانية مائة و أربعون |
| Croatian | devet tisuća osamsto četrdeset |
| Czech | devět tisíc osm set čtyřicet |
| Danish | ni tusinde otte hundrede fyrre |
| Dutch | negenduizend achthonderdveertig |
| Estonian | akpe asieke alafa enyi kple blaene |
| Faroese | níggju tusin og áttahundraðogfýrati |
| Filipino | siyám na libó’t walóng daán at ápat na pû |
| Finnish | yhdeksäntuhattakahdeksansataaneljäkymmentä |
| French | neuf mille huit cent quarante |
| Greek | εννέα χίλιάδες οκτακόσια σαράντα |
| German | neuntausendachthundertvierzig |
| Hebrew | תשעת אלפים שמונה מאות ארבעים |
| Hindi | नौ हज़ार आठ सौ चालीस |
| Hungarian | kilencezernyolcszáznegyven |
| Icelandic | níu þúsund og áttahundrað og fjörutíu |
| Indonesian | sembilan ribu delapan ratus empat puluh |
| Italian | novemilaottocentoquaranta |
| Japanese | 九千八百四十 |
| Korean | 구천팔백사십 |
| Latvian | deviņtūkstoš astoņsimt četrdesmit |
| Lithuanian | devyni tūkstančiai aštuoni šimtai keturiasdešimt |
| Norwegian | ni tusen åtte hundre og førti |
| Persian | نه هزار و هشتصد و چهل |
| Polish | dziewięć tysięcy osiemset czterdzieści |
| Portuguese | nove mil oitocentos e quarenta |
| Romanian | nouă mii opt sute patruzeci |
| Russian | девять тысяч восемьсот сорок |
| Serbian | девет хиљада осамсто четрдесет |
| Slovak | deväť tisíc osemsto štyridsať |
| Slovene | devet tisuću osemsto štirideset |
| Spanish | nueve mil ochocientos cuarenta |
| Swahili | elfu tisa, mia nane na arobaini |
| Swedish | niotusenåttahundrafyrtio |
| Thai | เก้าพันแปดร้อยสี่สิบ |
| Turkish | dokuz bin sekiz yüz kırk |
| Ukrainian | девʼять тисяч вісімсот сорок |
| Vietnamese | chín nghìn tám trăm bốn mươi |
| Number 9840 reversed | 0489 | |
| Unicode Character | U+2670 | ♰ |
| Unix Timestamp | Thu, 01 Jan 1970 02:44:00 +0000 | |