18968013 has 20 divisors (see below), whose sum is σ = 29105340. Its totient is φ = 12301632.

The previous prime is 18967999. The next prime is 18968021. The reversal of 18968013 is 31086981.

It can be written as a sum of positive squares in 2 ways, for example, as 15824484 + 3143529 = 3978^2 + 1773^2 .

It is not a de Polignac number, because 18968013 - 2¹⁰ = 18966989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18968513) 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 19 ways as a sum of consecutive naturals, for example, 168 + ... + 6161.

It is an arithmetic number, because the mean of its divisors is an integer number (1455267).

Almost surely, 2^18968013 is an apocalyptic number.

It is an amenable number.

18968013 is a deficient number, since it is larger than the sum of its proper divisors (10137327).

18968013 is an equidigital number, since it uses as much as digits as its factorization.

18968013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6378 (or 6369 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18968013 is about 4355.2282374176. The cubic root of 18968013 is about 266.6903366142.

The spelling of 18968013 in words is "eighteen million, nine hundred sixty-eight thousand, thirteen".