• 408 can be written using four 4's:
408 is nontrivially palindromic in base 5 and base 14.
408 is an esthetic number in base 14, because in such base its adjacent digits differ by 1.
It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.
408 is an idoneal number.
408 is an undulating number in base 14.
It is a plaindrome in base 7 and base 13.
It is a nialpdrome in base 8.
It is a zygodrome in base 2 and base 7.
It is a congruent number.
408 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
In principle, a polygon with 408 sides can be constructed with ruler and compass.
408 is the 12-th octagonal number.
It is an amenable number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
408 is a wasteful number, since it uses less digits than its factorization.
408 is an evil number, because the sum of its binary digits is even.
The square root of 408 is about 20.1990098767. The cubic root of 408 is about 7.4168595385.
The spelling of 408 in words is "four hundred eight", and thus it is an aban number.