9855989 has 16 divisors (see below), whose sum is σ = 11679360. Its totient is φ = 8199360.

The previous prime is 9855977. The next prime is 9855991. The reversal of 9855989 is 9895589.

It is a de Polignac number, because none of the positive numbers 2^k-9855989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9855989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9855929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22232 + ... + 22670.

It is an arithmetic number, because the mean of its divisors is an integer number (729960).

Almost surely, 2^9855989 is an apocalyptic number.

It is an amenable number.

9855989 is a deficient number, since it is larger than the sum of its proper divisors (1823371).

9855989 is a wasteful number, since it uses less digits than its factorization.

9855989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620.

The product of its digits is 1166400, while the sum is 53.

The square root of 9855989 is about 3139.4249473431. The cubic root of 9855989 is about 214.4042566751.

The spelling of 9855989 in words is "nine million, eight hundred fifty-five thousand, nine hundred eighty-nine".