38638709 has 2 divisors, whose sum is σ = 38638710. Its totient is φ = 38638708.

The previous prime is 38638703. The next prime is 38638711. The reversal of 38638709 is 90783683.

38638709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20448484 + 18190225 = 4522^2 + 4265^2 .

It is an emirp because it is prime and its reverse (90783683) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38638709 is a prime.

It is a Sophie Germain prime.

Together with 38638711, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 38638709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38638703) 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 as a sum of consecutive naturals, namely, 19319354 + 19319355.

It is an arithmetic number, because the mean of its divisors is an integer number (19319355).

Almost surely, 2^38638709 is an apocalyptic number.

It is an amenable number.

38638709 is a deficient number, since it is larger than the sum of its proper divisors (1).

38638709 is an equidigital number, since it uses as much as digits as its factorization.

38638709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 38638709 is about 6216.0042631903. The cubic root of 38638709 is about 338.0707022713.

The spelling of 38638709 in words is "thirty-eight million, six hundred thirty-eight thousand, seven hundred nine".