12181608 has 48 divisors (see below), whose sum is σ = 33380100. Its totient is φ = 4012800.

The previous prime is 12181607. The next prime is 12181613. The reversal of 12181608 is 80618121.

It can be written as a sum of positive squares in 2 ways, for example, as 10227204 + 1954404 = 3198^2 + 1398^2 .

It is not an unprimeable number, because it can be changed into a prime (12181607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5458 + ... + 7358.

Almost surely, 2^12181608 is an apocalyptic number.

12181608 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12181608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16690050).

12181608 is an abundant number, since it is smaller than the sum of its proper divisors (21198492).

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

12181608 is a wasteful number, since it uses less digits than its factorization.

12181608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2002 (or 1995 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 12181608 is about 3490.2160391586. The cubic root of 12181608 is about 230.0920110753.

Adding to 12181608 its reverse (80618121), we get a palindrome (92799729).

The spelling of 12181608 in words is "twelve million, one hundred eighty-one thousand, six hundred eight".