9728981 has 8 divisors (see below), whose sum is σ = 10367424. Its totient is φ = 9097920.

The previous prime is 9728941. The next prime is 9729017. The reversal of 9728981 is 1898279.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9728981 - 2¹⁰ = 9727957 is a prime.

It is a super-2 number, since 2×9728981² = 189306142596722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9728921) 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 in 7 ways as a sum of consecutive naturals, for example, 1016 + ... + 4526.

It is an arithmetic number, because the mean of its divisors is an integer number (1295928).

Almost surely, 2^9728981 is an apocalyptic number.

It is an amenable number.

9728981 is a deficient number, since it is larger than the sum of its proper divisors (638443).

9728981 is a wasteful number, since it uses less digits than its factorization.

9728981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3691.

The product of its digits is 72576, while the sum is 44.

The square root of 9728981 is about 3119.1314496186. The cubic root of 9728981 is about 213.4793073748.

The spelling of 9728981 in words is "nine million, seven hundred twenty-eight thousand, nine hundred eighty-one".