9873521 has 16 divisors (see below), whose sum is σ = 12082560. Its totient is φ = 7879680.

The previous prime is 9873503. The next prime is 9873527. The reversal of 9873521 is 1253789.

It is not a de Polignac number, because 9873521 - 2¹⁴ = 9857137 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (9873527) 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 in 15 ways as a sum of consecutive naturals, for example, 7505 + ... + 8721.

It is an arithmetic number, because the mean of its divisors is an integer number (755160).

Almost surely, 2^9873521 is an apocalyptic number.

It is an amenable number.

9873521 is a deficient number, since it is larger than the sum of its proper divisors (2209039).

9873521 is a wasteful number, since it uses less digits than its factorization.

9873521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1304.

The product of its digits is 15120, while the sum is 35.

The square root of 9873521 is about 3142.2159378375. The cubic root of 9873521 is about 214.5313100098.

The spelling of 9873521 in words is "nine million, eight hundred seventy-three thousand, five hundred twenty-one".