12161860 has 24 divisors (see below), whose sum is σ = 25807320. Its totient is φ = 4813824.

The previous prime is 12161839. The next prime is 12161867. The reversal of 12161860 is 6816121.

It can be written as a sum of positive squares in 4 ways, for example, as 492804 + 11669056 = 702^2 + 3416^2 .

It is not an unprimeable number, because it can be changed into a prime (12161867) 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 7 ways as a sum of consecutive naturals, for example, 1195 + ... + 5074.

It is an arithmetic number, because the mean of its divisors is an integer number (1075305).

Almost surely, 2^12161860 is an apocalyptic number.

12161860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12161860 is an abundant number, since it is smaller than the sum of its proper divisors (13645460).

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

12161860 is a wasteful number, since it uses less digits than its factorization.

12161860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6375 (or 6373 counting only the distinct ones).

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

The square root of 12161860 is about 3487.3858404255. The cubic root of 12161860 is about 229.9676072843.

Adding to 12161860 its reverse (6816121), we get a palindrome (18977981).

The spelling of 12161860 in words is "twelve million, one hundred sixty-one thousand, eight hundred sixty".