18823873 has 2 divisors, whose sum is σ = 18823874. Its totient is φ = 18823872.

The previous prime is 18823843. The next prime is 18823907. The reversal of 18823873 is 37832881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12306064 + 6517809 = 3508^2 + 2553^2 .

It is a cyclic number.

It is not a de Polignac number, because 18823873 - 2⁵ = 18823841 is a prime.

It is not a weakly prime, because it can be changed into another prime (18823843) 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, 9411936 + 9411937.

It is an arithmetic number, because the mean of its divisors is an integer number (9411937).

Almost surely, 2^18823873 is an apocalyptic number.

It is an amenable number.

18823873 is a deficient number, since it is larger than the sum of its proper divisors (1).

18823873 is an equidigital number, since it uses as much as digits as its factorization.

18823873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 40.

The square root of 18823873 is about 4338.6487527801. The cubic root of 18823873 is about 266.0130818749.

The spelling of 18823873 in words is "eighteen million, eight hundred twenty-three thousand, eight hundred seventy-three".