9998890 has 32 divisors (see below), whose sum is σ = 20793024. Its totient is φ = 3421440.

The previous prime is 9998887. The next prime is 9998893. The reversal of 9998890 is 988999.

It is an interprime number because it is at equal distance from previous prime (9998887) and next prime (9998893).

It is not an unprimeable number, because it can be changed into a prime (9998893) 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, 804 + ... + 4543.

It is an arithmetic number, because the mean of its divisors is an integer number (649782).

Almost surely, 2^9998890 is an apocalyptic number.

9998890 is an abundant number, since it is smaller than the sum of its proper divisors (10794134).

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

9998890 is a wasteful number, since it uses less digits than its factorization.

9998890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5382.

The product of its (nonzero) digits is 419904, while the sum is 52.

The square root of 9998890 is about 3162.1021488877. The cubic root of 9998890 is about 215.4354972999.

It can be divided in two parts, 999 and 8890, that added together give a palindrome (9889).

The spelling of 9998890 in words is "nine million, nine hundred ninety-eight thousand, eight hundred ninety".