9873989 has 4 divisors (see below), whose sum is σ = 10114860. Its totient is φ = 9633120.

The previous prime is 9873979. The next prime is 9874003. The reversal of 9873989 is 9893789.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5484964 + 4389025 = 2342^2 + 2095^2 .

It is a cyclic number.

It is not a de Polignac number, because 9873989 - 2⁸ = 9873733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 9873989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9873979) 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 3 ways as a sum of consecutive naturals, for example, 120374 + ... + 120455.

It is an arithmetic number, because the mean of its divisors is an integer number (2528715).

Almost surely, 2^9873989 is an apocalyptic number.

It is an amenable number.

9873989 is a deficient number, since it is larger than the sum of its proper divisors (240871).

9873989 is a wasteful number, since it uses less digits than its factorization.

9873989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240870.

The product of its digits is 979776, while the sum is 53.

The square root of 9873989 is about 3142.2904066938. The cubic root of 9873989 is about 214.5346995155.

The spelling of 9873989 in words is "nine million, eight hundred seventy-three thousand, nine hundred eighty-nine".