46 (forty-six) is the natural number following 45 and preceding 47.

46 is a composite number, a centered triangular number,^[1] and a Wedderburn-Etherington number, and an Erdős–Woods number.^[2]

• The number of mountains in the 46 peaks of the Adirondack mountain range. People who have climbed all of them are called "forty-sixers".^[3]
• The number 46 is used to identify Valentino Rossi. The number is retired (no longer used) in the MotoGP after Rossi's retirement in 2022.

Forty-six is also:

• Because 46 in Japanese can be pronounced as "yon roku", and "yoroshiku" (よろしく) means "my best regards" in Japanese, people sometimes use 46 for greeting.
• An international calling code for Sweden.