The year 5840 תת״מ
5840 in the Jewish calendar is written ה׳תת״מ — the ה is the 5,000 years, and the letters after it are the 840 since. Written on its own, as it is on nearly every page that carries a date, the year is תת״מ, and those letters add to 840.
The letters, and what each is worth
400 + 400 + 40 = 840, computed by the same engine that computes every value on this site, over the same consonantal letters.
Why the five thousand is missing
The full form is ה׳תת״מ: the first letter carries the 5,000. In ordinary use it is left off and the year is written תת״מ followed by לפ״ק — lifrat katan, “by the minor reckoning”, which is the writer saying out loud that the thousands have been dropped. It is a habit of writing and not a claim about the number: the year is 5,840, and 840 is what its letters spell.
What the letters spell
No word of the twenty-four books is written תתמ, though the same letters rearranged do spell words the text uses. The year’s letters are a numeral here, not a word, and this page will not make one out of them.
840 in the Tanakh
92 words, 894 phrases and 2 whole verses carry the value 840 under the standard method — 986 matches in all.
The letters of a Jewish year are a numeral, and this page treats them as one. Every value here is the engine’s, computed on the consonantal letters at the moment the page is served, and every count is read from the Westminster Leningrad Codex. Nothing on this page is a prediction.