It is a double factorial (105 = 7 !! = 1 ⋅ 3 ⋅ 5 ⋅ 7 ).
105 is nontrivially palindromic in base 4, base 8 and base 14.
105 is an esthetic number in base 7 and base 12, because in such bases it adjacent digits differ by 1.
It is a sphenic number, since it is the product of 3 distinct primes.
105 is an idoneal number.
It is an alternating number because its digits alternate between odd and even.
105 is an undulating number in base 8.
It is a Curzon number.
105 is a lucky number.
105 is a nontrivial repdigit in base 14.
It is a plaindrome in base 9, base 12, base 14 and base 16.
It is a nialpdrome in base 5, base 7, base 11, base 13, base 14 and base 15.
It is a zygodrome in base 14.
It is a Zeisel number, with parameters (1, 2).
105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.
105 is the 14-th triangular number.
It is an amenable number.
105 is an equidigital number, since it uses as much as digits as its factorization.
105 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 15.
The square root of 105 is about 10.2469507660. The cubic root of 105 is about 4.7176939803.
The spelling of 105 in words is "one hundred five", and is thus an aban number.