38665989 has 6 divisors (see below), whose sum is σ = 55850886. Its totient is φ = 25777320.

The previous prime is 38665981. The next prime is 38666051. The reversal of 38665989 is 98956683.

It can be written as a sum of positive squares in only one way, i.e., 19873764 + 18792225 = 4458^2 + 4335^2 .

It is not a de Polignac number, because 38665989 - 2³ = 38665981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38665981) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2148102 + ... + 2148119.

It is an arithmetic number, because the mean of its divisors is an integer number (9308481).

Almost surely, 2^38665989 is an apocalyptic number.

It is an amenable number.

38665989 is a deficient number, since it is larger than the sum of its proper divisors (17184897).

38665989 is a wasteful number, since it uses less digits than its factorization.

38665989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4296227 (or 4296224 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The square root of 38665989 is about 6218.1982117009. The cubic root of 38665989 is about 338.1502459844.

The spelling of 38665989 in words is "thirty-eight million, six hundred sixty-five thousand, nine hundred eighty-nine".