38685809 has 2 divisors, whose sum is σ = 38685810. Its totient is φ = 38685808.

The previous prime is 38685763. The next prime is 38685827. The reversal of 38685809 is 90858683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28058209 + 10627600 = 5297^2 + 3260^2 .

It is an emirp because it is prime and its reverse (90858683) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38685809 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (38685859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19342904 + 19342905.

It is an arithmetic number, because the mean of its divisors is an integer number (19342905).

Almost surely, 2^38685809 is an apocalyptic number.

It is an amenable number.

38685809 is a deficient number, since it is larger than the sum of its proper divisors (1).

38685809 is an equidigital number, since it uses as much as digits as its factorization.

38685809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 47.

The square root of 38685809 is about 6219.7917167699. The cubic root of 38685809 is about 338.2080141782.

The spelling of 38685809 in words is "thirty-eight million, six hundred eighty-five thousand, eight hundred nine".