It is the 8-th Fibonacci number F8.
34 is nontrivially palindromic in base 4 and base 16.
34 is an esthetic number in base 6 and base 10, because in such bases it adjacent digits differ by 1.
It is a semiprime because it is the product of two primes.
It is a magnanimous number.
It is an alternating number because its digits alternate between odd and even.
34 is an undulating number in base 4.
34 is a nontrivial repdigit in base 16.
It is a plaindrome in base 5, base 7, base 9, base 10, base 12, base 13, base 14, base 15 and base 16.
It is a nialpdrome in base 6, base 8, base 11 and base 16.
It is a zygodrome in base 16.
It is a congruent number.
It is a panconsummate number.
A polygon with 34 sides can be constructed with ruler and compass.
34 is the 4-th heptagonal number.
34 is a wasteful number, since it uses less digits than its factorization.
34 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 19.
The square root of 34 is about 5.8309518948. The cubic root of 34 is about 3.2396118013.