38668613 has 2 divisors, whose sum is σ = 38668614. Its totient is φ = 38668612.

The previous prime is 38668607. The next prime is 38668633. The reversal of 38668613 is 31686683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36457444 + 2211169 = 6038^2 + 1487^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38668613 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38668603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19334306 + 19334307.

It is an arithmetic number, because the mean of its divisors is an integer number (19334307).

Almost surely, 2^38668613 is an apocalyptic number.

It is an amenable number.

38668613 is a deficient number, since it is larger than the sum of its proper divisors (1).

38668613 is an equidigital number, since it uses as much as digits as its factorization.

38668613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 41.

The square root of 38668613 is about 6218.4092017171. The cubic root of 38668613 is about 338.1578951372.

The spelling of 38668613 in words is "thirty-eight million, six hundred sixty-eight thousand, six hundred thirteen".