1242 is nontrivially palindromic in base 8, base 11 and base 13.
1242 is an esthetic number in base 12, because in such base its adjacent digits differ by 1.
1242 is an undulating number in base 11 and base 13.
It is a plaindrome in base 15.
It is a nialpdrome in base 6 and base 12.
It is a congruent number.
1242 is the 18-th decagonal number.
It is a practical number, because each smaller number is the sum of distinct divisors of 1242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1440).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1242 is a wasteful number, since it uses less digits than its factorization.
1242 is an evil number, because the sum of its binary digits is even.
The square root of 1242 is about 35.2420203734. The cubic root of 1242 is about 10.7491436130.
Adding to 1242 its reverse (2421), we get a palindrome (3663).
The spelling of 1242 in words is "one thousand, two hundred forty-two", and thus it is an iban number.