38639389 has 2 divisors, whose sum is σ = 38639390. Its totient is φ = 38639388.

The previous prime is 38639353. The next prime is 38639437. The reversal of 38639389 is 98393683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21483225 + 17156164 = 4635^2 + 4142^2 .

It is a cyclic number.

It is not a de Polignac number, because 38639389 - 2¹¹ = 38637341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38639309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19319694 + 19319695.

It is an arithmetic number, because the mean of its divisors is an integer number (19319695).

Almost surely, 2^38639389 is an apocalyptic number.

It is an amenable number.

38639389 is a deficient number, since it is larger than the sum of its proper divisors (1).

38639389 is an equidigital number, since it uses as much as digits as its factorization.

38639389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 49.

The square root of 38639389 is about 6216.0589604668. The cubic root of 38639389 is about 338.0726854874.

The spelling of 38639389 in words is "thirty-eight million, six hundred thirty-nine thousand, three hundred eighty-nine".