The cubic root of 343 is 7.
343 is nontrivially palindromic in base 6, base 10 and base 11.
343 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.
It is an alternating number because its digits alternate between odd and even.
It is the 19-th Hogben number.
It is a Duffinian number.
343 is an undulating number in base 10 and base 11.
It is a plaindrome in base 4, base 5, base 12, base 15 and base 16.
It is a nialpdrome in base 7 and base 9.
It is a congruent number.
343 is a Friedman number, since it can be written as (4+3)^3, using all its digits and the basic arithmetic operations.
343 is an frugal number, since it uses more digits than its factorization.
343 is an evil number, because the sum of its binary digits is even.
The square root of 343 is about 18.5202591775.
Adding to 343 its sum of digits (10), we get a palindrome (353).
Subtracting from 343 its sum of digits (10), we obtain a palindrome (333).