Il numero 1840, milleottocentoquaranta in Italiano, in Inglese si dice one thousand eight hundred forty.
Il numero ordinale 1840° in inglese si dice one thousand eight hundred fortieth.
1831: one thousand eight hundred thirty-one
1832: one thousand eight hundred thirty-two
1833: one thousand eight hundred thirty-three
1834: one thousand eight hundred thirty-four
1835: one thousand eight hundred thirty-five
1836: one thousand eight hundred thirty-six
1837: one thousand eight hundred thirty-seven
1838: one thousand eight hundred thirty-eight
1839: one thousand eight hundred thirty-nine
1841: one thousand eight hundred forty-one
1842: one thousand eight hundred forty-two
1843: one thousand eight hundred forty-three
1844: one thousand eight hundred forty-four
1845: one thousand eight hundred forty-five
1846: one thousand eight hundred forty-six
1847: one thousand eight hundred forty-seven
1848: one thousand eight hundred forty-eight
1849: one thousand eight hundred forty-nine