385038509 has 2 divisors, whose sum is σ = 385038510. Its totient is φ = 385038508.

The previous prime is 385038443. The next prime is 385038529. The reversal of 385038509 is 905830583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 385022884 + 15625 = 19622^2 + 125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-385038509 is a prime.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385038529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192519254 + 192519255.

It is an arithmetic number, because the mean of its divisors is an integer number (192519255).

Almost surely, 2^385038509 is an apocalyptic number.

It is an amenable number.

385038509 is a deficient number, since it is larger than the sum of its proper divisors (1).

385038509 is an equidigital number, since it uses as much as digits as its factorization.

385038509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 385038509 is about 19622.3981459963. The cubic root of 385038509 is about 727.5028890270.

The spelling of 385038509 in words is "three hundred eighty-five million, thirty-eight thousand, five hundred nine".