18042143 has 16 divisors (see below), whose sum is σ = 21964800. Its totient is φ = 14785848.

The previous prime is 18042139. The next prime is 18042149. The reversal of 18042143 is 34124081.

It is not a de Polignac number, because 18042143 - 2² = 18042139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18042149) 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, 6746 + ... + 9032.

It is an arithmetic number, because the mean of its divisors is an integer number (1372800).

Almost surely, 2^18042143 is an apocalyptic number.

18042143 is a deficient number, since it is larger than the sum of its proper divisors (3922657).

18042143 is an equidigital number, since it uses as much as digits as its factorization.

18042143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2331 (or 2317 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 18042143 is about 4247.6043836497. The cubic root of 18042143 is about 262.2785094610.

The spelling of 18042143 in words is "eighteen million, forty-two thousand, one hundred forty-three".