9938728 has 32 divisors (see below), whose sum is σ = 19310760. Its totient is φ = 4792320.

The previous prime is 9938701. The next prime is 9938749. The reversal of 9938728 is 8278399.

9938728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3678724 + 6260004 = 1918^2 + 2502^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51400 + ... + 51592.

Almost surely, 2^9938728 is an apocalyptic number.

It is an amenable number.

9938728 is a deficient number, since it is larger than the sum of its proper divisors (9372032).

9938728 is a wasteful number, since it uses less digits than its factorization.

9938728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397 (or 393 counting only the distinct ones).

The product of its digits is 217728, while the sum is 46.

The square root of 9938728 is about 3152.5748206823. The cubic root of 9938728 is about 215.0025454900.

The spelling of 9938728 in words is "nine million, nine hundred thirty-eight thousand, seven hundred twenty-eight".