38989981 has 2 divisors, whose sum is σ = 38989982. Its totient is φ = 38989980.

The previous prime is 38989967. The next prime is 38990009. The reversal of 38989981 is 18998983.

38989981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26101881 + 12888100 = 5109^2 + 3590^2 .

It is an emirp because it is prime and its reverse (18998983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38989981 - 2⁹ = 38989469 is a prime.

It is a super-2 number, since 2×38989981² = 3040437236760722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38989901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19494990 + 19494991.

It is an arithmetic number, because the mean of its divisors is an integer number (19494991).

Almost surely, 2^38989981 is an apocalyptic number.

It is an amenable number.

38989981 is a deficient number, since it is larger than the sum of its proper divisors (1).

38989981 is an equidigital number, since it uses as much as digits as its factorization.

38989981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1119744, while the sum is 55.

The square root of 38989981 is about 6244.1957848870. The cubic root of 38989981 is about 339.0921020302.

The spelling of 38989981 in words is "thirty-eight million, nine hundred eighty-nine thousand, nine hundred eighty-one".