12181242 has 16 divisors (see below), whose sum is σ = 25644960. Its totient is φ = 3846672.

The previous prime is 12181217. The next prime is 12181243. The reversal of 12181242 is 24218121.

It is not an unprimeable number, because it can be changed into a prime (12181243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53313 + ... + 53540.

It is an arithmetic number, because the mean of its divisors is an integer number (1602810).

Almost surely, 2^12181242 is an apocalyptic number.

12181242 is an abundant number, since it is smaller than the sum of its proper divisors (13463718).

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

12181242 is a wasteful number, since it uses less digits than its factorization.

12181242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106877.

The product of its digits is 256, while the sum is 21.

The square root of 12181242 is about 3490.1636064804. The cubic root of 12181242 is about 230.0897066582.

Adding to 12181242 its reverse (24218121), we get a palindrome (36399363).

The spelling of 12181242 in words is "twelve million, one hundred eighty-one thousand, two hundred forty-two".