8739389 has 2 divisors, whose sum is σ = 8739390. Its totient is φ = 8739388.

The previous prime is 8739359. The next prime is 8739391. The reversal of 8739389 is 9839378.

8739389 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., 8602489 + 136900 = 2933^2 + 370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8739389 is a prime.

Together with 8739391, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8739349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4369694 + 4369695.

It is an arithmetic number, because the mean of its divisors is an integer number (4369695).

Almost surely, 2^8739389 is an apocalyptic number.

It is an amenable number.

8739389 is a deficient number, since it is larger than the sum of its proper divisors (1).

8739389 is an equidigital number, since it uses as much as digits as its factorization.

8739389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 47.

The square root of 8739389 is about 2956.2457610963. The cubic root of 8739389 is about 205.9809342332.

The spelling of 8739389 in words is "eight million, seven hundred thirty-nine thousand, three hundred eighty-nine".