Magnificence seven

Some people think they have some number that deserved to be feared, admire, etc. some think 13 is a scare number. A legend told on that date, Church made order to annihilate a group of knight.
Some admire at 1 because it mean champions, top of the top, etc.
But some admire at seven. Why?
Week consist of seven days. In 8Th day, it enter new week. It can be told as new life.
A baby ready to born after seven month.
People said, god do crowned in 7Th space.
People also said that sky and earth consist of seven layer. (in Indonesia, there a many songs which are have lyric consist seven layer or earth and sky)
Do those seem magnificence to you?