9820729 has 2 divisors, whose sum is σ = 9820730. Its totient is φ = 9820728.

The previous prime is 9820721. The next prime is 9820751. The reversal of 9820729 is 9270289.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9753129 + 67600 = 3123^2 + 260^2 .

It is a cyclic number.

It is not a de Polignac number, because 9820729 - 2³ = 9820721 is a prime.

It is an Ulam number.

9820729 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (9820721) 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, 4910364 + 4910365.

It is an arithmetic number, because the mean of its divisors is an integer number (4910365).

Almost surely, 2^9820729 is an apocalyptic number.

It is an amenable number.

9820729 is a deficient number, since it is larger than the sum of its proper divisors (1).

9820729 is an equidigital number, since it uses as much as digits as its factorization.

9820729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 9820729 is about 3133.8042376639. The cubic root of 9820729 is about 214.1482726476.

It can be divided in two parts, 982072 and 9, that added together give a square (982081 = 991²).

The spelling of 9820729 in words is "nine million, eight hundred twenty thousand, seven hundred twenty-nine".