9987389 has 2 divisors, whose sum is σ = 9987390. Its totient is φ = 9987388.

The previous prime is 9987323. The next prime is 9987391. The reversal of 9987389 is 9837899.

9987389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7198489 + 2788900 = 2683^2 + 1670^2 .

It is a cyclic number.

It is not a de Polignac number, because 9987389 - 2¹² = 9983293 is a prime.

Together with 9987391, 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 9987389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9987889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4993694 + 4993695.

It is an arithmetic number, because the mean of its divisors is an integer number (4993695).

Almost surely, 2^9987389 is an apocalyptic number.

It is an amenable number.

9987389 is a deficient number, since it is larger than the sum of its proper divisors (1).

9987389 is an equidigital number, since it uses as much as digits as its factorization.

9987389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 53.

The square root of 9987389 is about 3160.2830569428. The cubic root of 9987389 is about 215.3528656530.

The spelling of 9987389 in words is "nine million, nine hundred eighty-seven thousand, three hundred eighty-nine".