9985128 has 32 divisors (see below), whose sum is σ = 26049600. Its totient is φ = 3183488.

The previous prime is 9985123. The next prime is 9985139. The reversal of 9985128 is 8215899.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 9985128.

It is not an unprimeable number, because it can be changed into a prime (9985123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8493 + ... + 9596.

It is an arithmetic number, because the mean of its divisors is an integer number (814050).

Almost surely, 2^9985128 is an apocalyptic number.

It is an amenable number.

9985128 is an abundant number, since it is smaller than the sum of its proper divisors (16064472).

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

9985128 is a wasteful number, since it uses less digits than its factorization.

9985128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18121 (or 18117 counting only the distinct ones).

The product of its digits is 51840, while the sum is 42.

The square root of 9985128 is about 3159.9253155731. The cubic root of 9985128 is about 215.3366135048.

The spelling of 9985128 in words is "nine million, nine hundred eighty-five thousand, one hundred twenty-eight".