729173 has 2 divisors, whose sum is σ = 729174. Its totient is φ = 729172.

The previous prime is 729143. The next prime is 729187. The reversal of 729173 is 371927.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 611524 + 117649 = 782^2 + 343^2 .

729173 is a truncatable prime.

It is an emirp because it is prime and its reverse (371927) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 729173 - 2¹² = 725077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (729143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364586 + 364587.

It is an arithmetic number, because the mean of its divisors is an integer number (364587).

2⁷²⁹¹⁷³ is an apocalyptic number.

It is an amenable number.

729173 is a deficient number, since it is larger than the sum of its proper divisors (1).

729173 is an equidigital number, since it uses as much as digits as its factorization.

729173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2646, while the sum is 29.

The square root of 729173 is about 853.9162722422. The cubic root of 729173 is about 90.0071187785.

The spelling of 729173 in words is "seven hundred twenty-nine thousand, one hundred seventy-three".