12018689 has 4 divisors (see below), whose sum is σ = 12081156. Its totient is φ = 11956224.

The previous prime is 12018683. The next prime is 12018703. The reversal of 12018689 is 98681021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3579664 + 8439025 = 1892^2 + 2905^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12018689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12018683) 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, 30944 + ... + 31329.

It is an arithmetic number, because the mean of its divisors is an integer number (3020289).

Almost surely, 2^12018689 is an apocalyptic number.

It is an amenable number.

12018689 is a deficient number, since it is larger than the sum of its proper divisors (62467).

12018689 is an equidigital number, since it uses as much as digits as its factorization.

12018689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62466.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 12018689 is about 3466.7980904575. The cubic root of 12018689 is about 229.0616399987.

The spelling of 12018689 in words is "twelve million, eighteen thousand, six hundred eighty-nine".