8489729 has 2 divisors, whose sum is σ = 8489730. Its totient is φ = 8489728.

The previous prime is 8489659. The next prime is 8489743. The reversal of 8489729 is 9279848.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7924225 + 565504 = 2815^2 + 752^2 .

It is a cyclic number.

It is not a de Polignac number, because 8489729 - 2⁸ = 8489473 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (8489329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4244864 + 4244865.

It is an arithmetic number, because the mean of its divisors is an integer number (4244865).

Almost surely, 2^8489729 is an apocalyptic number.

It is an amenable number.

8489729 is a deficient number, since it is larger than the sum of its proper divisors (1).

8489729 is an equidigital number, since it uses as much as digits as its factorization.

8489729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 47.

The square root of 8489729 is about 2913.7139530160. The cubic root of 8489729 is about 204.0005206318. Note that the first 3 decimals are identical.

The spelling of 8489729 in words is "eight million, four hundred eighty-nine thousand, seven hundred twenty-nine".