• 142 can be written using four 4's:
142 is nontrivially palindromic in base 3 and base 7.
142 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
142 is an esthetic number in base 12, because in such base its adjacent digits differ by 1.
It is a semiprime because it is the product of two primes.
142 is an undulating number in base 7.
It is a plaindrome in base 9, base 11, base 13 and base 16.
It is a nialpdrome in base 12, base 14 and base 15.
It is a congruent number.
142 is an equidigital number, since it uses as much as digits as its factorization.
142 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 73.
The square root of 142 is about 11.9163752878. The cubic root of 142 is about 5.2171034463.
Adding to 142 its reverse (241), we get a palindrome (383).
Subtracting 142 from its reverse (241), we obtain a palindrome (99).