9875989 has 4 divisors (see below), whose sum is σ = 9884556. Its totient is φ = 9867424.

The previous prime is 9875981. The next prime is 9876017. The reversal of 9875989 is 9895789.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 5640625 + 4235364 = 2375^2 + 2058^2 .

It is a cyclic number.

It is not a de Polignac number, because 9875989 - 2³ = 9875981 is a prime.

It is a Duffinian number.

9875989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9875981) 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, 2224 + ... + 4969.

It is an arithmetic number, because the mean of its divisors is an integer number (2471139).

Almost surely, 2^9875989 is an apocalyptic number.

It is an amenable number.

9875989 is a deficient number, since it is larger than the sum of its proper divisors (8567).

9875989 is a wasteful number, since it uses less digits than its factorization.

9875989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8566.

The product of its digits is 1632960, while the sum is 55.

The square root of 9875989 is about 3142.6086297851. The cubic root of 9875989 is about 214.5491833758.

The spelling of 9875989 in words is "nine million, eight hundred seventy-five thousand, nine hundred eighty-nine".