18005113 has 8 divisors (see below), whose sum is σ = 21472128. Its totient is φ = 14761824.

The previous prime is 18005101. The next prime is 18005129. The reversal of 18005113 is 31150081.

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

It is not a de Polignac number, because 18005113 - 2⁹ = 18004601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18006113) 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 7 ways as a sum of consecutive naturals, for example, 55756 + ... + 56077.

It is an arithmetic number, because the mean of its divisors is an integer number (2684016).

Almost surely, 2^18005113 is an apocalyptic number.

It is an amenable number.

18005113 is a deficient number, since it is larger than the sum of its proper divisors (3467015).

18005113 is a wasteful number, since it uses less digits than its factorization.

18005113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111863.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 18005113 is about 4243.2432171630. The cubic root of 18005113 is about 262.0989516101.

Adding to 18005113 its reverse (31150081), we get a palindrome (49155194).

The spelling of 18005113 in words is "eighteen million, five thousand, one hundred thirteen".