9889842 has 16 divisors (see below), whose sum is σ = 20820960. Its totient is φ = 3123072.

The previous prime is 9889813. The next prime is 9889843. The reversal of 9889842 is 2489889.

It is a junction number, because it is equal to n+sod(n) for n = 9889791 and 9889800.

It is not an unprimeable number, because it can be changed into a prime (9889843) 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 7 ways as a sum of consecutive naturals, for example, 43263 + ... + 43490.

It is an arithmetic number, because the mean of its divisors is an integer number (1301310).

Almost surely, 2^9889842 is an apocalyptic number.

9889842 is an abundant number, since it is smaller than the sum of its proper divisors (10931118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9889842 is a wasteful number, since it uses less digits than its factorization.

9889842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86777.

The product of its digits is 331776, while the sum is 48.

The square root of 9889842 is about 3144.8119180644. The cubic root of 9889842 is about 214.6494521943.

It can be divided in two parts, 9889 and 842, that added together give a triangular number (10731 = T₁₄₆).

The spelling of 9889842 in words is "nine million, eight hundred eighty-nine thousand, eight hundred forty-two".