12181626 has 36 divisors (see below), whose sum is σ = 27131598. Its totient is φ = 3948672.

The previous prime is 12181619. The next prime is 12181627. The reversal of 12181626 is 62618121.

It can be written as a sum of positive squares in 3 ways, for example, as 4347225 + 7834401 = 2085^2 + 2799^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12181626.

It is not an unprimeable number, because it can be changed into a prime (12181627) 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 17 ways as a sum of consecutive naturals, for example, 107746 + ... + 107858.

Almost surely, 2^12181626 is an apocalyptic number.

12181626 is an abundant number, since it is smaller than the sum of its proper divisors (14949972).

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

12181626 is a wasteful number, since it uses less digits than its factorization.

12181626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287 (or 171 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 12181626 is about 3490.2186177946. The cubic root of 12181626 is about 230.0921244061.

Adding to 12181626 its reverse (62618121), we get a palindrome (74799747).

The spelling of 12181626 in words is "twelve million, one hundred eighty-one thousand, six hundred twenty-six".