9989958 has 32 divisors (see below), whose sum is σ = 22747392. Its totient is φ = 2895200.

The previous prime is 9989957. The next prime is 9990017. The reversal of 9989958 is 8599899.

9989958 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 9989898 and 9989907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9989957) 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, 1773 + ... + 4808.

It is an arithmetic number, because the mean of its divisors is an integer number (710856).

Almost surely, 2^9989958 is an apocalyptic number.

9989958 is an abundant number, since it is smaller than the sum of its proper divisors (12757434).

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

9989958 is a wasteful number, since it uses less digits than its factorization.

9989958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6620.

The product of its digits is 2099520, while the sum is 57.

The square root of 9989958 is about 3160.6894817429. The cubic root of 9989958 is about 215.3713287395.

The spelling of 9989958 in words is "nine million, nine hundred eighty-nine thousand, nine hundred fifty-eight".