12109387 has 4 divisors (see below), whose sum is σ = 12337920. Its totient is φ = 11880856.

The previous prime is 12109381. The next prime is 12109411. The reversal of 12109387 is 78390121.

12109387 is digitally balanced in base 2, 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: 78390121 = 1709 ⋅45869.

It is a cyclic number.

It is not a de Polignac number, because 12109387 - 2¹⁵ = 12076619 is a prime.

It is a Duffinian number.

It is a zygodrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (12109381) 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, 114187 + ... + 114292.

It is an arithmetic number, because the mean of its divisors is an integer number (3084480).

Almost surely, 2^12109387 is an apocalyptic number.

12109387 is a deficient number, since it is larger than the sum of its proper divisors (228533).

12109387 is an equidigital number, since it uses as much as digits as its factorization.

12109387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228532.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 12109387 is about 3479.8544509792. The cubic root of 12109387 is about 229.6363946058.

The spelling of 12109387 in words is "twelve million, one hundred nine thousand, three hundred eighty-seven".