The Meaning of 400 Years.

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Number of years from David to the exile.
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The captivity of the Hebrews in Egypt had to last 400 years. But thanks to the merits of Isaac and Joseph, this time of slavery was shortened of 190 years.
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It is the number of year that will survive the just before the advent of the Messiah, the resurrection and the general judgement, according to one of the seven visions of the second book of Ezra in the writings of the library of Qumran.
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One year in the Mayas lasted 400 days.
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The 400 warriors laid out on the square place of the Temple of Coricancha, at a rate of hundred per side, during the feast of the Moon, at Incas.
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The Senate of Athens counted 400 members in Antiquity.
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The popular French expression "to make the 400 blows" means "to lead a reckless life". In 1622, Louis XIII fires 400 shots with his canons in order to show his force to the besiege of Montauban. We considers that the expression comes from this debauchery of artillery.
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In each cycle of 400 years of the Gregorian calendar, the 13 of the month coinciding with Friday arrives more often than any other day of the week.
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In mathematics, there are 400 grades in a circle.