12442109 has 4 divisors (see below), whose sum is σ = 12646140. Its totient is φ = 12238080.

The previous prime is 12442099. The next prime is 12442117. The reversal of 12442109 is 90124421.

12442109 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90124421 = 101 ⋅892321.

It can be written as a sum of positive squares in 2 ways, for example, as 2393209 + 10048900 = 1547^2 + 3170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12442109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12442139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101924 + ... + 102045.

It is an arithmetic number, because the mean of its divisors is an integer number (3161535).

Almost surely, 2^12442109 is an apocalyptic number.

It is an amenable number.

12442109 is a deficient number, since it is larger than the sum of its proper divisors (204031).

12442109 is an equidigital number, since it uses as much as digits as its factorization.

12442109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204030.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 12442109 is about 3527.3373810851. The cubic root of 12442109 is about 231.7206122037.

The spelling of 12442109 in words is "twelve million, four hundred forty-two thousand, one hundred nine".