720173 has 2 divisors, whose sum is σ = 720174. Its totient is φ = 720172.

The previous prime is 720151. The next prime is 720179. The reversal of 720173 is 371027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 426409 + 293764 = 653^2 + 542^2 .

It is an emirp because it is prime and its reverse (371027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 720173 - 2¹⁰ = 719149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360086 + 360087.

It is an arithmetic number, because the mean of its divisors is an integer number (360087).

2⁷²⁰¹⁷³ is an apocalyptic number.

It is an amenable number.

720173 is a deficient number, since it is larger than the sum of its proper divisors (1).

720173 is an equidigital number, since it uses as much as digits as its factorization.

720173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 294, while the sum is 20.

The square root of 720173 is about 848.6300725287. The cubic root of 720173 is about 89.6352729028.

The spelling of 720173 in words is "seven hundred twenty thousand, one hundred seventy-three", and thus it is an iban number.