1242185238 has 48 divisors (see below), whose sum is σ = 3159031200. Its totient is φ = 345316608.

The previous prime is 1242185237. The next prime is 1242185239. The reversal of 1242185238 is 8325812421.

It is a happy number.

1242185238 is a `hidden beast` number, since 1 + 242 + 185 + 238 = 666.

It is an interprime number because it is at equal distance from previous prime (1242185237) and next prime (1242185239).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242185237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 128563 + ... + 137886.

It is an arithmetic number, because the mean of its divisors is an integer number (65813150).

Almost surely, 2^1242185238 is an apocalyptic number.

1242185238 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1242185238 is an abundant number, since it is smaller than the sum of its proper divisors (1916845962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1242185238 is a wasteful number, since it uses less digits than its factorization.

1242185238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266501 (or 266498 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 1242185238 is about 35244.6483597155. The cubic root of 1242185238 is about 1074.9677979898.

Adding to 1242185238 its reverse (8325812421), we get a palindrome (9567997659).

The spelling of 1242185238 in words is "one billion, two hundred forty-two million, one hundred eighty-five thousand, two hundred thirty-eight".