9928993 has 4 divisors (see below), whose sum is σ = 9935380. Its totient is φ = 9922608.

The previous prime is 9928981. The next prime is 9928999. The reversal of 9928993 is 3998299.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1096209 + 8832784 = 1047^2 + 2972^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9928993 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9928999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 823 + ... + 4531.

It is an arithmetic number, because the mean of its divisors is an integer number (2483845).

Almost surely, 2^9928993 is an apocalyptic number.

It is an amenable number.

9928993 is a deficient number, since it is larger than the sum of its proper divisors (6387).

9928993 is a wasteful number, since it uses less digits than its factorization.

9928993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6386.

The product of its digits is 314928, while the sum is 49.

The square root of 9928993 is about 3151.0304663713. The cubic root of 9928993 is about 214.9323241117.

It can be divided in two parts, 99 and 28993, that added together give a palindrome (29092).

The spelling of 9928993 in words is "nine million, nine hundred twenty-eight thousand, nine hundred ninety-three".