0415

0415 is a four-digit numeric string that can refer to different things in different contexts. Interpreted as decimal digits, the value is 415. In mathematics, 415 is a composite number equal to 5 × 83; its divisors include 1, 5, 83, and 415.

In programming, a leading zero often denotes octal notation. In languages such as C, 0415 is treated as an octal literal, which equals decimal 269.

As a calendar reference, 04/15 corresponds to April 15 in the month-day format used in the United States and several other countries. It is commonly associated with tax deadlines in the United States, although the exact due date can shift if it falls on a weekend or holiday. Several historical events are tied to this date, including the death of Abraham Lincoln in 1865 and the sinking of the RMS Titanic in 1912; the 2013 Boston Marathon bombing also occurred on April 15.

In data storage and identifiers, 0415 may be used as a zero-padded code, inventory number, or product identifier where a fixed width is required. The string thus serves as a flexible label across mathematics, computing, calendrics, and information systems.