Why is the number 17 considered unlucky in some cultures?

Why is the number 17 considered unlucky in some cultures?

While numbers like 13 and 4 are famously dreaded worldwide, the number 17 holds a distinct reputation for bad luck, most notably in Italy.

The Italian Superstition

In Italy, the fear of the number 17 is known as heptaskaudekaphobia. The primary reason for this superstition lies in Roman numerals. The number 17 is written as XVII. If you rearrange the letters, it spells the word VIXI, which translates from Latin to "I have lived"—implying "my life is over" or death.

Mathematical and Philosophical Roots

Ancient Greek philosopher Pythagoras and his followers disliked the number 17 because it fell squarely between 16 and 18, which are the only two numbers representing the areas of standard geometric rectangles (4x4 and 3x6). Because 17 could not form a neat geometric shape, the Pythagoreans viewed it as imperfect and disruptive.

Religious Connections

In various Judeo-Christian traditions, the number 17 is sometimes associated with negativity because the Great Flood in the Book of Genesis is said to have begun on the 17th day of the second month.

Due to these historical, linguistic, and religious factors, many Italian hotels lack a room 17, and some airlines avoid having a row 17.