38775509 has 2 divisors, whose sum is σ = 38775510. Its totient is φ = 38775508.

The previous prime is 38775481. The next prime is 38775511. The reversal of 38775509 is 90557783.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38254225 + 521284 = 6185^2 + 722^2 .

It is an emirp because it is prime and its reverse (90557783) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38775509 is a prime.

Together with 38775511, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 38775509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38775559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19387754 + 19387755.

It is an arithmetic number, because the mean of its divisors is an integer number (19387755).

Almost surely, 2^38775509 is an apocalyptic number.

It is an amenable number.

38775509 is a deficient number, since it is larger than the sum of its proper divisors (1).

38775509 is an equidigital number, since it uses as much as digits as its factorization.

38775509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 264600, while the sum is 44.

The square root of 38775509 is about 6226.9983940900. The cubic root of 38775509 is about 338.4692110904.

The spelling of 38775509 in words is "thirty-eight million, seven hundred seventy-five thousand, five hundred nine".