18005842 has 8 divisors (see below), whose sum is σ = 27271296. Its totient is φ = 8915412.

The previous prime is 18005821. The next prime is 18005843. The reversal of 18005842 is 24850081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×18005842² = 648420692257928, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18005842.

It is not an unprimeable number, because it can be changed into a prime (18005843) 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 3 ways as a sum of consecutive naturals, for example, 43498 + ... + 43909.

It is an arithmetic number, because the mean of its divisors is an integer number (3408912).

Almost surely, 2^18005842 is an apocalyptic number.

18005842 is a deficient number, since it is larger than the sum of its proper divisors (9265454).

18005842 is a wasteful number, since it uses less digits than its factorization.

18005842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87512.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 18005842 is about 4243.3291175680. The cubic root of 18005842 is about 262.1024888934.

The spelling of 18005842 in words is "eighteen million, five thousand, eight hundred forty-two".