12109985 has 4 divisors (see below), whose sum is σ = 14531988. Its totient is φ = 9687984.

The previous prime is 12109969. The next prime is 12109987. The reversal of 12109985 is 58990121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58990121 = 547 ⋅107843.

It can be written as a sum of positive squares in 2 ways, for example, as 6431296 + 5678689 = 2536^2 + 2383^2 .

It is a cyclic number.

It is not a de Polignac number, because 12109985 - 2⁴ = 12109969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12109987) 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, 1210994 + ... + 1211003.

It is an arithmetic number, because the mean of its divisors is an integer number (3632997).

Almost surely, 2^12109985 is an apocalyptic number.

It is an amenable number.

12109985 is a deficient number, since it is larger than the sum of its proper divisors (2422003).

12109985 is an equidigital number, since it uses as much as digits as its factorization.

12109985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2422002.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 12109985 is about 3479.9403730524. The cubic root of 12109985 is about 229.6401746018.

The spelling of 12109985 in words is "twelve million, one hundred nine thousand, nine hundred eighty-five".