9928891 has 16 divisors (see below), whose sum is σ = 11741184. Its totient is φ = 8220384.

The previous prime is 9928889. The next prime is 9928903. The reversal of 9928891 is 1988299.

It is a happy number.

9928891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 9928891 - 2¹ = 9928889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9928291) 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, 33741 + ... + 34033.

It is an arithmetic number, because the mean of its divisors is an integer number (733824).

Almost surely, 2^9928891 is an apocalyptic number.

9928891 is a deficient number, since it is larger than the sum of its proper divisors (1812293).

9928891 is a wasteful number, since it uses less digits than its factorization.

9928891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450.

The product of its digits is 93312, while the sum is 46.

The square root of 9928891 is about 3151.0142811482. The cubic root of 9928891 is about 214.9315881132.

The spelling of 9928891 in words is "nine million, nine hundred twenty-eight thousand, eight hundred ninety-one".