312 (three hundred [and] twelve) is the natural number following 311 and preceding 313.

Mathematical properties

• It's an even number.
• It's a semi perfect number, as it is equal to the sum of some or all of its divisors.
• It's a Idoneal number.^[1]
• It is a Harshad number, as it is divisible by the sum of its digits.^[2]
• It's part of the Pythagorean triplets
• It's a practical number.