408 is the sum of four consecutive primes: 408 = 97 + 101 + 103 + 107. It is also the sum of eight consecutive primes: 408 = 37 + 41 + 43 + 47 + 53 + 59 + 61 + 67.
408 is an octagonal number.
408 is the eighth Pell number.
408 is 3113 in base 5, 1122 in base 7, and 212 in base 14.
408 is the telephone area code for the Silicon Valley, California.
Source: What's Special About This Number?
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