18844873 has 2 divisors, whose sum is σ = 18844874. Its totient is φ = 18844872.

The previous prime is 18844853. The next prime is 18844909. The reversal of 18844873 is 37844881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14040009 + 4804864 = 3747^2 + 2192^2 .

It is an emirp because it is prime and its reverse (37844881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18844873 - 2⁵ = 18844841 is a prime.

It is a super-2 number, since 2×18844873² = 710258476772258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18844853) 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, 9422436 + 9422437.

It is an arithmetic number, because the mean of its divisors is an integer number (9422437).

Almost surely, 2^18844873 is an apocalyptic number.

It is an amenable number.

18844873 is a deficient number, since it is larger than the sum of its proper divisors (1).

18844873 is an equidigital number, since it uses as much as digits as its factorization.

18844873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172032, while the sum is 43.

The square root of 18844873 is about 4341.0681865182. The cubic root of 18844873 is about 266.1119669210. Note that the first 3 decimals are identical.

The spelling of 18844873 in words is "eighteen million, eight hundred forty-four thousand, eight hundred seventy-three".