18643143 has 16 divisors (see below), whose sum is σ = 25826400. Its totient is φ = 11948160.

The previous prime is 18643129. The next prime is 18643147. The reversal of 18643143 is 34134681.

It is not a de Polignac number, because 18643143 - 2⁵ = 18643111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18643143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18643147) 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 in 15 ways as a sum of consecutive naturals, for example, 36373 + ... + 36881.

It is an arithmetic number, because the mean of its divisors is an integer number (1614150).

Almost surely, 2^18643143 is an apocalyptic number.

18643143 is a deficient number, since it is larger than the sum of its proper divisors (7183257).

18643143 is a wasteful number, since it uses less digits than its factorization.

18643143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962.

The product of its digits is 6912, while the sum is 30.

The square root of 18643143 is about 4317.7706053008. The cubic root of 18643143 is about 265.1590027146.

The spelling of 18643143 in words is "eighteen million, six hundred forty-three thousand, one hundred forty-three".