18004143 has 16 divisors (see below), whose sum is σ = 24710400. Its totient is φ = 11653824.

The previous prime is 18004121. The next prime is 18004171. The reversal of 18004143 is 34140081.

It is not a de Polignac number, because 18004143 - 2¹³ = 17995951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18009143) 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, 29758 + ... + 30356.

It is an arithmetic number, because the mean of its divisors is an integer number (1544400).

Almost surely, 2^18004143 is an apocalyptic number.

18004143 is a deficient number, since it is larger than the sum of its proper divisors (6706257).

18004143 is a wasteful number, since it uses less digits than its factorization.

18004143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 18004143 is about 4243.1289162598. The cubic root of 18004143 is about 262.0942447888.

The spelling of 18004143 in words is "eighteen million, four thousand, one hundred forty-three".