The number 7 is a natural number that comes after 6 and before 8. It holds significance in mathematics as a prime number with many unique properties: it's a Mersenne prime, a double Mersenne prime, and appears in special equations like the Ramanujan–Nagell equation. Seven is also the first regular polygon that cannot be constructed by compass and straightedge (heptagon). It has many cultural, religious, and symbolic associations, such as the seven days of the week, the seven colors in the rainbow, seven continents, seven deadly sins, and more. Seven is often considered a lucky number in Western culture, and it appears frequently in various fields including psychology, classical antiquity, and cosmology.
Aside from the number itself, "7" is also the title of a notable song by Prince and the New Power Generation, released in 1992. The song features religious and apocalyptic themes and achieved chart success in various countries, including peaking at number 7 on the US Billboard Hot 100.
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