18872143 has 2 divisors, whose sum is σ = 18872144. Its totient is φ = 18872142.

The previous prime is 18872123. The next prime is 18872173. The reversal of 18872143 is 34127881.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (34127881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18872143 - 2¹³ = 18863951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18872099 and 18872108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18872123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9436071 + 9436072.

It is an arithmetic number, because the mean of its divisors is an integer number (9436072).

Almost surely, 2^18872143 is an apocalyptic number.

18872143 is a deficient number, since it is larger than the sum of its proper divisors (1).

18872143 is an equidigital number, since it uses as much as digits as its factorization.

18872143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 34.

The square root of 18872143 is about 4344.2079830505. The cubic root of 18872143 is about 266.2402666400.

The spelling of 18872143 in words is "eighteen million, eight hundred seventy-two thousand, one hundred forty-three".