12786109 has 6 divisors (see below), whose sum is σ = 14873694. Its totient is φ = 10959480.

The previous prime is 12786101. The next prime is 12786119. The reversal of 12786109 is 90168721.

It is a happy number.

12786109 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 only one way, i.e., 12744900 + 41209 = 3570^2 + 203^2 .

It is not a de Polignac number, because 12786109 - 2³ = 12786101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12786101) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 130422 + ... + 130519.

It is an arithmetic number, because the mean of its divisors is an integer number (2478949).

Almost surely, 2^12786109 is an apocalyptic number.

It is an amenable number.

12786109 is a deficient number, since it is larger than the sum of its proper divisors (2087585).

12786109 is an equidigital number, since it uses as much as digits as its factorization.

12786109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260955 (or 260948 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 12786109 is about 3575.7669107480. The cubic root of 12786109 is about 233.8367685728.

The spelling of 12786109 in words is "twelve million, seven hundred eighty-six thousand, one hundred nine".