12109789 has 4 divisors (see below), whose sum is σ = 12391456. Its totient is φ = 11828124.

The previous prime is 12109697. The next prime is 12109817. The reversal of 12109789 is 98790121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98790121 = 8501 ⋅11621.

It is a cyclic number.

It is not a de Polignac number, because 12109789 - 2⁹ = 12109277 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 (12109589) 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, 140769 + ... + 140854.

It is an arithmetic number, because the mean of its divisors is an integer number (3097864).

Almost surely, 2^12109789 is an apocalyptic number.

It is an amenable number.

12109789 is a deficient number, since it is larger than the sum of its proper divisors (281667).

12109789 is an equidigital number, since it uses as much as digits as its factorization.

12109789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281666.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 12109789 is about 3479.9122115364. The cubic root of 12109789 is about 229.6389356871.

The spelling of 12109789 in words is "twelve million, one hundred nine thousand, seven hundred eighty-nine".