9890128 has 20 divisors (see below), whose sum is σ = 19304320. Its totient is φ = 4908384.

The previous prime is 9890081. The next prime is 9890149. The reversal of 9890128 is 8210989.

9890128 is a nontrivial binomial coefficient, being equal to C(4448, 2).

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1 + ... + 4447.

It is an arithmetic number, because the mean of its divisors is an integer number (965216).

Almost surely, 2^9890128 is an apocalyptic number.

9890128 is the 4447-th triangular number and also the 2224-th hexagonal number.

9890128 is the 1483-rd centered nonagonal number.

It is an amenable number.

9890128 is a deficient number, since it is larger than the sum of its proper divisors (9414192).

9890128 is a wasteful number, since it uses less digits than its factorization.

9890128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4594 (or 4588 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 9890128 is about 3144.8573894535. The cubic root of 9890128 is about 214.6515212922.

The spelling of 9890128 in words is "nine million, eight hundred ninety thousand, one hundred twenty-eight".