38939917 has 2 divisors, whose sum is σ = 38939918. Its totient is φ = 38939916.

The previous prime is 38939909. The next prime is 38939939. The reversal of 38939917 is 71993983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30261001 + 8678916 = 5501^2 + 2946^2 .

It is a cyclic number.

It is not a de Polignac number, because 38939917 - 2³ = 38939909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38939977) 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, 19469958 + 19469959.

It is an arithmetic number, because the mean of its divisors is an integer number (19469959).

Almost surely, 2^38939917 is an apocalyptic number.

It is an amenable number.

38939917 is a deficient number, since it is larger than the sum of its proper divisors (1).

38939917 is an equidigital number, since it uses as much as digits as its factorization.

38939917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 49.

The square root of 38939917 is about 6240.1856542895. The cubic root of 38939917 is about 338.9469059419.

The spelling of 38939917 in words is "thirty-eight million, nine hundred thirty-nine thousand, nine hundred seventeen".