18975143 has 4 divisors (see below), whose sum is σ = 20700168. Its totient is φ = 17250120.

The previous prime is 18975133. The next prime is 18975163. The reversal of 18975143 is 34157981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18975143 - 2⁶ = 18975079 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18975097 and 18975106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18975133) 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 in 3 ways as a sum of consecutive naturals, for example, 862496 + ... + 862517.

It is an arithmetic number, because the mean of its divisors is an integer number (5175042).

Almost surely, 2^18975143 is an apocalyptic number.

18975143 is a deficient number, since it is larger than the sum of its proper divisors (1725025).

18975143 is a wasteful number, since it uses less digits than its factorization.

18975143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725024.

The product of its digits is 30240, while the sum is 38.

The square root of 18975143 is about 4356.0467169212. The cubic root of 18975143 is about 266.7237483707.

The spelling of 18975143 in words is "eighteen million, nine hundred seventy-five thousand, one hundred forty-three".