38664709 has 2 divisors, whose sum is σ = 38664710. Its totient is φ = 38664708.

The previous prime is 38664701. The next prime is 38664721. The reversal of 38664709 is 90746683.

It is a happy number.

38664709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38167684 + 497025 = 6178^2 + 705^2 .

It is an emirp because it is prime and its reverse (90746683) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38664709 - 2³ = 38664701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38664701) 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, 19332354 + 19332355.

It is an arithmetic number, because the mean of its divisors is an integer number (19332355).

Almost surely, 2^38664709 is an apocalyptic number.

It is an amenable number.

38664709 is a deficient number, since it is larger than the sum of its proper divisors (1).

38664709 is an equidigital number, since it uses as much as digits as its factorization.

38664709 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 43.

The square root of 38664709 is about 6218.0952871438. The cubic root of 38664709 is about 338.1465145648.

The spelling of 38664709 in words is "thirty-eight million, six hundred sixty-four thousand, seven hundred nine".