• 242 can be written using four 4's:

242 has 6 divisors (see below), whose sum is σ = 399. Its totient is φ = 110.

The previous prime is 241. The next prime is 251.

Added to its reverse (242) it gives a square (484 = 22^{2}).

242 is nontrivially palindromic in base 3, base 7 and base 10.

It is a Cunningham number, because it is equal to 3^{5}-1.

It can be written as a sum of positive squares in only one way, i.e., 121 + 121 = 11^2 + 11^2 .

It is an ABA number since it can be written as A⋅B^{A}, here for A=2, B=11.

It is a Duffinian number.

242 is an undulating number in base 7 and base 10.

242 is a nontrivial repdigit in base 3.

It is a plaindrome in base 3, base 9, base 13, base 14 and base 15.

It is a nialpdrome in base 3, base 11 and base 16.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 17 + ... + 27.

242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

242 is a deficient number, since it is larger than the sum of its proper divisors (157).

242 is a wasteful number, since it uses less digits than its factorization.

242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24 (or 13 counting only the distinct ones).

The product of its digits is 16, while the sum is 8.

The square root of 242 is about 15.5563491861. The cubic root of 242 is about 6.2316796844.

It can be divided in two parts, 2 and 42, that added together give a palindrome (44).

The spelling of 242 in words is "two hundred forty-two", and thus it is an aban number and an iban number.

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