18866713 has 4 divisors (see below), whose sum is σ = 18917668. Its totient is φ = 18815760.

The previous prime is 18866671. The next prime is 18866741. The reversal of 18866713 is 31766881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31766881 = 1931 ⋅16451.

It can be written as a sum of positive squares in 2 ways, for example, as 11614464 + 7252249 = 3408^2 + 2693^2 .

It is a cyclic number.

It is not a de Polignac number, because 18866713 - 2¹⁷ = 18735641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18866773) 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, 24918 + ... + 25663.

It is an arithmetic number, because the mean of its divisors is an integer number (4729417).

Almost surely, 2^18866713 is an apocalyptic number.

It is an amenable number.

18866713 is a deficient number, since it is larger than the sum of its proper divisors (50955).

18866713 is an equidigital number, since it uses as much as digits as its factorization.

18866713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50954.

The product of its digits is 48384, while the sum is 40.

The square root of 18866713 is about 4343.5829680115. The cubic root of 18866713 is about 266.2147294709.

The spelling of 18866713 in words is "eighteen million, eight hundred sixty-six thousand, seven hundred thirteen".