416

416 is a natural number that follows 415 and precedes 417. In mathematics, it is an even composite number, with prime factorization 2^5 × 13. Its digits sum to 11, and it can be expressed in Roman numerals as CDXVI. As a base-10 integer, it appears in various counting, arithmetic, and coding contexts.

In telephony, 416 is the original geographic area code for Toronto, Ontario, Canada, under the North American Numbering Plan. It has been associated with central Toronto for decades. As demand for phone numbers grew, the region was overlaid with additional area codes, leading many local calls to use ten-digit dialing (area code plus local number) even for calls within the same city. The 416 designation remains closely linked to the city in media, branding, and everyday reference.

Beyond mathematics and telephony, 416 is encountered in various domain-specific codes and identifiers where it is used as a numeric label. While it has no single universally notable meaning beyond these contexts, it is recognized by residents of Toronto and by people familiar with Canadian area codes as a shorthand for the city.