12109887 has 12 divisors (see below), whose sum is σ = 17592120. Its totient is φ = 8027088.

The previous prime is 12109873. The next prime is 12109901. The reversal of 12109887 is 78890121.

12109887 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12109873) and next prime (12109901).

It is not a de Polignac number, because 12109887 - 2¹¹ = 12107839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12109817) 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 11 ways as a sum of consecutive naturals, for example, 2148 + ... + 5369.

It is an arithmetic number, because the mean of its divisors is an integer number (1466010).

Almost surely, 2^12109887 is an apocalyptic number.

12109887 is a deficient number, since it is larger than the sum of its proper divisors (5482233).

12109887 is a wasteful number, since it uses less digits than its factorization.

12109887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7702 (or 7699 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 12109887 is about 3479.9262923229. The cubic root of 12109887 is about 229.6395551461.

It can be divided in two parts, 12109 and 887, that added together give a square (12996 = 114²).

The spelling of 12109887 in words is "twelve million, one hundred nine thousand, eight hundred eighty-seven".