18043542 has 24 divisors (see below), whose sum is σ = 42648840. Its totient is φ = 5467680.

The previous prime is 18043537. The next prime is 18043561. The reversal of 18043542 is 24534081.

18043542 is a `hidden beast` number, since 1 + 80 + 43 + 542 = 666.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 45367 + ... + 45762.

It is an arithmetic number, because the mean of its divisors is an integer number (1777035).

Almost surely, 2^18043542 is an apocalyptic number.

18043542 is an abundant number, since it is smaller than the sum of its proper divisors (24605298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18043542 is a wasteful number, since it uses less digits than its factorization.

18043542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91148 (or 91145 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 18043542 is about 4247.7690615192. The cubic root of 18043542 is about 262.2852883703.

The spelling of 18043542 in words is "eighteen million, forty-three thousand, five hundred forty-two".