9939858 has 16 divisors (see below), whose sum is σ = 20160576. Its totient is φ = 3266480.

The previous prime is 9939857. The next prime is 9939893. The reversal of 9939858 is 8589399.

It is a self number, because there is not a number n which added to its sum of digits gives 9939858.

It is not an unprimeable number, because it can be changed into a prime (9939857) 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, 11241 + ... + 12092.

It is an arithmetic number, because the mean of its divisors is an integer number (1260036).

Almost surely, 2^9939858 is an apocalyptic number.

9939858 is an abundant number, since it is smaller than the sum of its proper divisors (10220718).

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

9939858 is a wasteful number, since it uses less digits than its factorization.

9939858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23409.

The product of its digits is 699840, while the sum is 51.

The square root of 9939858 is about 3152.7540341739. The cubic root of 9939858 is about 215.0106935370.

The spelling of 9939858 in words is "nine million, nine hundred thirty-nine thousand, eight hundred fifty-eight".