8729389 has 2 divisors, whose sum is σ = 8729390. Its totient is φ = 8729388.

The previous prime is 8729333. The next prime is 8729401. The reversal of 8729389 is 9839278.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4588164 + 4141225 = 2142^2 + 2035^2 .

It is a cyclic number.

It is not a de Polignac number, because 8729389 - 2¹³ = 8721197 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8729309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4364694 + 4364695.

It is an arithmetic number, because the mean of its divisors is an integer number (4364695).

Almost surely, 2^8729389 is an apocalyptic number.

It is an amenable number.

8729389 is a deficient number, since it is larger than the sum of its proper divisors (1).

8729389 is an equidigital number, since it uses as much as digits as its factorization.

8729389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 46.

The square root of 8729389 is about 2954.5539426451. The cubic root of 8729389 is about 205.9023400476.

The spelling of 8729389 in words is "eight million, seven hundred twenty-nine thousand, three hundred eighty-nine".