12181650 has 48 divisors (see below), whose sum is σ = 32539584. Its totient is φ = 2998080.

The previous prime is 12181649. The next prime is 12181681. The reversal of 12181650 is 5618121.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 12181650.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1174 + ... + 5073.

It is an arithmetic number, because the mean of its divisors is an integer number (677908).

Almost surely, 2^12181650 is an apocalyptic number.

12181650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12181650 is an abundant number, since it is smaller than the sum of its proper divisors (20357934).

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

12181650 is a wasteful number, since it uses less digits than its factorization.

12181650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6275 (or 6270 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 12181650 is about 3490.2220559729. Note that the first 3 decimals coincide. The cubic root of 12181650 is about 230.0922755137.

Adding to 12181650 its reverse (5618121), we get a palindrome (17799771).

The spelling of 12181650 in words is "twelve million, one hundred eighty-one thousand, six hundred fifty".