38663809 has 2 divisors, whose sum is σ = 38663810. Its totient is φ = 38663808.

The previous prime is 38663791. The next prime is 38663819. The reversal of 38663809 is 90836683.

38663809 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., 26553409 + 12110400 = 5153^2 + 3480^2 .

It is a cyclic number.

It is not a de Polignac number, because 38663809 - 2⁵ = 38663777 is a prime.

It is not a weakly prime, because it can be changed into another prime (38663819) 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, 19331904 + 19331905.

It is an arithmetic number, because the mean of its divisors is an integer number (19331905).

Almost surely, 2^38663809 is an apocalyptic number.

It is an amenable number.

38663809 is a deficient number, since it is larger than the sum of its proper divisors (1).

38663809 is an equidigital number, since it uses as much as digits as its factorization.

38663809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 38663809 is about 6218.0229172945. The cubic root of 38663809 is about 338.1438908610.

The spelling of 38663809 in words is "thirty-eight million, six hundred sixty-three thousand, eight hundred nine".