9780729 has 16 divisors (see below), whose sum is σ = 15781248. Its totient is φ = 5260032.

The previous prime is 9780721. The next prime is 9780731. The reversal of 9780729 is 9270879.

It is not a de Polignac number, because 9780729 - 2³ = 9780721 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9780721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13342 + ... + 14055.

It is an arithmetic number, because the mean of its divisors is an integer number (986328).

Almost surely, 2^9780729 is an apocalyptic number.

It is an amenable number.

9780729 is a deficient number, since it is larger than the sum of its proper divisors (6000519).

9780729 is a wasteful number, since it uses less digits than its factorization.

9780729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27424.

The product of its (nonzero) digits is 63504, while the sum is 42.

The square root of 9780729 is about 3127.4157062981. The cubic root of 9780729 is about 213.8571338051.

The spelling of 9780729 in words is "nine million, seven hundred eighty thousand, seven hundred twenty-nine".