38636809 has 2 divisors, whose sum is σ = 38636810. Its totient is φ = 38636808.

The previous prime is 38636797. The next prime is 38636821. The reversal of 38636809 is 90863683.

It is a balanced prime because it is at equal distance from previous prime (38636797) and next prime (38636821).

It can be written as a sum of positive squares in only one way, i.e., 23309584 + 15327225 = 4828^2 + 3915^2 .

It is a cyclic number.

It is not a de Polignac number, because 38636809 - 2²⁵ = 5082377 is a prime.

It is not a weakly prime, because it can be changed into another prime (38631809) 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, 19318404 + 19318405.

It is an arithmetic number, because the mean of its divisors is an integer number (19318405).

Almost surely, 2^38636809 is an apocalyptic number.

It is an amenable number.

38636809 is a deficient number, since it is larger than the sum of its proper divisors (1).

38636809 is an equidigital number, since it uses as much as digits as its factorization.

38636809 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 38636809 is about 6215.8514300134. The cubic root of 38636809 is about 338.0651608089.

The spelling of 38636809 in words is "thirty-eight million, six hundred thirty-six thousand, eight hundred nine".