8729173 has 2 divisors, whose sum is σ = 8729174. Its totient is φ = 8729172.

The previous prime is 8729141. The next prime is 8729179. The reversal of 8729173 is 3719278.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7851204 + 877969 = 2802^2 + 937^2 .

8729173 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 8729173 - 2⁵ = 8729141 is a prime.

It is a super-2 number, since 2×8729173² = 152396922527858, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8729179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4364586 + 4364587.

It is an arithmetic number, because the mean of its divisors is an integer number (4364587).

Almost surely, 2^8729173 is an apocalyptic number.

It is an amenable number.

8729173 is a deficient number, since it is larger than the sum of its proper divisors (1).

8729173 is an equidigital number, since it uses as much as digits as its factorization.

8729173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 37.

The square root of 8729173 is about 2954.5173886779. The cubic root of 8729173 is about 205.9006417511.

The spelling of 8729173 in words is "eight million, seven hundred twenty-nine thousand, one hundred seventy-three".