17139728 has 10 divisors (see below), whose sum is σ = 33208254. Its totient is φ = 8569856.

The previous prime is 17139721. The next prime is 17139779. The reversal of 17139728 is 82793171.

It can be written as a sum of positive squares in only one way, i.e., 16386304 + 753424 = 4048^2 + 868^2 .

It is a junction number, because it is equal to n+sod(n) for n = 17139691 and 17139700.

It is not an unprimeable number, because it can be changed into a prime (17139721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 535601 + ... + 535632.

Almost surely, 2^17139728 is an apocalyptic number.

It is an amenable number.

17139728 is a deficient number, since it is larger than the sum of its proper divisors (16068526).

17139728 is a wasteful number, since it uses less digits than its factorization.

17139728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071241 (or 1071235 counting only the distinct ones).

The product of its digits is 21168, while the sum is 38.

The square root of 17139728 is about 4140.0154589083. The cubic root of 17139728 is about 257.8307084024.

The spelling of 17139728 in words is "seventeen million, one hundred thirty-nine thousand, seven hundred twenty-eight".