18088013 has 4 divisors (see below), whose sum is σ = 18335868. Its totient is φ = 17840160.

The previous prime is 18087991. The next prime is 18088027. The reversal of 18088013 is 31088081.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10259209 + 7828804 = 3203^2 + 2798^2 .

It is a cyclic number.

It is not a de Polignac number, because 18088013 - 2⁸ = 18087757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18088033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123818 + ... + 123963.

It is an arithmetic number, because the mean of its divisors is an integer number (4583967).

Almost surely, 2^18088013 is an apocalyptic number.

It is an amenable number.

18088013 is a deficient number, since it is larger than the sum of its proper divisors (247855).

18088013 is an equidigital number, since it uses as much as digits as its factorization.

18088013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247854.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 18088013 is about 4253.0004702563. Note that the first 3 decimals coincide. The cubic root of 18088013 is about 262.5005919866.

The spelling of 18088013 in words is "eighteen million, eighty-eight thousand, thirteen".