12181660 has 24 divisors (see below), whose sum is σ = 26928720. Its totient is φ = 4616064.

The previous prime is 12181649. The next prime is 12181681. The reversal of 12181660 is 6618121.

12181660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15649 + ... + 16408.

It is an arithmetic number, because the mean of its divisors is an integer number (1122030).

Almost surely, 2^12181660 is an apocalyptic number.

12181660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12181660 is an abundant number, since it is smaller than the sum of its proper divisors (14747060).

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

12181660 is a wasteful number, since it uses less digits than its factorization.

12181660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32085 (or 32083 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 12181660 is about 3490.2234885463. The cubic root of 12181660 is about 230.0923384751.

Adding to 12181660 its reverse (6618121), we get a palindrome (18799781).

The spelling of 12181660 in words is "twelve million, one hundred eighty-one thousand, six hundred sixty".