18128013 has 4 divisors (see below), whose sum is σ = 24170688. Its totient is φ = 12085340.

The previous prime is 18127997. The next prime is 18128023. The reversal of 18128013 is 31082181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18128013 - 2⁴ = 18127997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18128023) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3021333 + ... + 3021338.

It is an arithmetic number, because the mean of its divisors is an integer number (6042672).

Almost surely, 2^18128013 is an apocalyptic number.

It is an amenable number.

18128013 is a deficient number, since it is larger than the sum of its proper divisors (6042675).

18128013 is an equidigital number, since it uses as much as digits as its factorization.

18128013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6042674.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 18128013 is about 4257.7004356812. The cubic root of 18128013 is about 262.6939482759.

The spelling of 18128013 in words is "eighteen million, one hundred twenty-eight thousand, thirteen".