8173729 has 2 divisors, whose sum is σ = 8173730. Its totient is φ = 8173728.

The previous prime is 8173709. The next prime is 8173751. The reversal of 8173729 is 9273718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4665600 + 3508129 = 2160^2 + 1873^2 .

It is a cyclic number.

It is not a de Polignac number, because 8173729 - 2¹³ = 8165537 is a prime.

8173729 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (8173709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4086864 + 4086865.

It is an arithmetic number, because the mean of its divisors is an integer number (4086865).

Almost surely, 2^8173729 is an apocalyptic number.

It is an amenable number.

8173729 is a deficient number, since it is larger than the sum of its proper divisors (1).

8173729 is an equidigital number, since it uses as much as digits as its factorization.

8173729 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 8173729 is about 2858.9734171552. The cubic root of 8173729 is about 201.4373865187.

The spelling of 8173729 in words is "eight million, one hundred seventy-three thousand, seven hundred twenty-nine".