12018709 has 4 divisors (see below), whose sum is σ = 12025804. Its totient is φ = 12011616.

The previous prime is 12018703. The next prime is 12018733. The reversal of 12018709 is 90781021.

12018709 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 a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7700625 + 4318084 = 2775^2 + 2078^2 .

It is a cyclic number.

It is not a de Polignac number, because 12018709 - 2¹⁷ = 11887637 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 (12018703) 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, 649 + ... + 4945.

It is an arithmetic number, because the mean of its divisors is an integer number (3006451).

Almost surely, 2^12018709 is an apocalyptic number.

It is an amenable number.

12018709 is a deficient number, since it is larger than the sum of its proper divisors (7095).

12018709 is an equidigital number, since it uses as much as digits as its factorization.

12018709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7094.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 12018709 is about 3466.8009749624. The cubic root of 12018709 is about 229.0617670572.

The spelling of 12018709 in words is "twelve million, eighteen thousand, seven hundred nine".