9985890 has 32 divisors (see below), whose sum is σ = 24526656. Its totient is φ = 2600640.

The previous prime is 9985879. The next prime is 9985891. The reversal of 9985890 is 985899.

9985890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (9985891) 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, 2581 + ... + 5160.

It is an arithmetic number, because the mean of its divisors is an integer number (766458).

Almost surely, 2^9985890 is an apocalyptic number.

9985890 is an abundant number, since it is smaller than the sum of its proper divisors (14540766).

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

9985890 is a wasteful number, since it uses less digits than its factorization.

9985890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7794.

The product of its (nonzero) digits is 233280, while the sum is 48.

The square root of 9985890 is about 3160.0458857428. The cubic root of 9985890 is about 215.3420910619.

The spelling of 9985890 in words is "nine million, nine hundred eighty-five thousand, eight hundred ninety".