12180865 has 8 divisors (see below), whose sum is σ = 14662440. Its totient is φ = 9714432.

The previous prime is 12180851. The next prime is 12180871. The reversal of 12180865 is 56808121.

12180865 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3560769 + 8620096 = 1887^2 + 2936^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12180865 - 2²¹ = 10083713 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1930 + ... + 5299.

It is an arithmetic number, because the mean of its divisors is an integer number (1832805).

Almost surely, 2^12180865 is an apocalyptic number.

It is an amenable number.

12180865 is a deficient number, since it is larger than the sum of its proper divisors (2481575).

12180865 is an equidigital number, since it uses as much as digits as its factorization.

12180865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7571.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 12180865 is about 3490.1095971330. The cubic root of 12180865 is about 230.0873329343.

Adding to 12180865 its reverse (56808121), we get a palindrome (68988986).

The spelling of 12180865 in words is "twelve million, one hundred eighty thousand, eight hundred sixty-five".