18844129 has 2 divisors, whose sum is σ = 18844130. Its totient is φ = 18844128.

The previous prime is 18844127. The next prime is 18844151. The reversal of 18844129 is 92144881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15816529 + 3027600 = 3977^2 + 1740^2 .

It is a cyclic number.

It is not a de Polignac number, because 18844129 - 2¹ = 18844127 is a prime.

Together with 18844127, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18844127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9422064 + 9422065.

It is an arithmetic number, because the mean of its divisors is an integer number (9422065).

Almost surely, 2^18844129 is an apocalyptic number.

It is an amenable number.

18844129 is a deficient number, since it is larger than the sum of its proper divisors (1).

18844129 is an equidigital number, since it uses as much as digits as its factorization.

18844129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 37.

The square root of 18844129 is about 4340.9824924779. The cubic root of 18844129 is about 266.1084648207.

The spelling of 18844129 in words is "eighteen million, eight hundred forty-four thousand, one hundred twenty-nine".