9988890 has 32 divisors (see below), whose sum is σ = 24624000. Its totient is φ = 2591424.

The previous prime is 9988879. The next prime is 9988907. The reversal of 9988890 is 988899.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3390 + ... + 5609.

It is an arithmetic number, because the mean of its divisors is an integer number (769500).

Almost surely, 2^9988890 is an apocalyptic number.

9988890 is an abundant number, since it is smaller than the sum of its proper divisors (14635110).

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

9988890 is a wasteful number, since it uses less digits than its factorization.

9988890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9046.

The product of its (nonzero) digits is 373248, while the sum is 51.

The square root of 9988890 is about 3160.5205267487. The cubic root of 9988890 is about 215.3636535395.

It can be divided in two parts, 9988 and 890, that added together give a triangular number (10878 = T₁₄₇).

The spelling of 9988890 in words is "nine million, nine hundred eighty-eight thousand, eight hundred ninety".