18138713 has 2 divisors, whose sum is σ = 18138714. Its totient is φ = 18138712.

The previous prime is 18138707. The next prime is 18138721. The reversal of 18138713 is 31783181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15272464 + 2866249 = 3908^2 + 1693^2 .

It is a cyclic number.

It is not a de Polignac number, because 18138713 - 2⁶ = 18138649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18138713.

It is not a weakly prime, because it can be changed into another prime (18138613) 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 as a sum of consecutive naturals, namely, 9069356 + 9069357.

It is an arithmetic number, because the mean of its divisors is an integer number (9069357).

Almost surely, 2^18138713 is an apocalyptic number.

It is an amenable number.

18138713 is a deficient number, since it is larger than the sum of its proper divisors (1).

18138713 is an equidigital number, since it uses as much as digits as its factorization.

18138713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 32.

The square root of 18138713 is about 4258.9567971512. The cubic root of 18138713 is about 262.7456228564.

The spelling of 18138713 in words is "eighteen million, one hundred thirty-eight thousand, seven hundred thirteen".