18844289 has 2 divisors, whose sum is σ = 18844290. Its totient is φ = 18844288.

The previous prime is 18844283. The next prime is 18844307. The reversal of 18844289 is 98244881.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11336689 + 7507600 = 3367^2 + 2740^2 .

It is a cyclic number.

It is not a de Polignac number, because 18844289 - 2²⁴ = 2067073 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18844283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9422144 + 9422145.

It is an arithmetic number, because the mean of its divisors is an integer number (9422145).

Almost surely, 2^18844289 is an apocalyptic number.

It is an amenable number.

18844289 is a deficient number, since it is larger than the sum of its proper divisors (1).

18844289 is an equidigital number, since it uses as much as digits as its factorization.

18844289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 147456, while the sum is 44.

The square root of 18844289 is about 4341.0009214466. Note that the first 3 decimals coincide. The cubic root of 18844289 is about 266.1092179683.

The spelling of 18844289 in words is "eighteen million, eight hundred forty-four thousand, two hundred eighty-nine".