1728317 has 2 divisors, whose sum is σ = 1728318. Its totient is φ = 1728316.

The previous prime is 1728269. The next prime is 1728319. The reversal of 1728317 is 7138271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1229881 + 498436 = 1109^2 + 706^2 .

It is a cyclic number.

It is not a de Polignac number, because 1728317 - 2⁶ = 1728253 is a prime.

Together with 1728319, it forms a pair of twin primes.

It is a Chen prime.

It is a d-powerful number, because it can be written as 1 + 7 + 2¹⁷ + 8³ + 3¹³ + 1 + 7⁴ .

It is a self number, because there is not a number n which added to its sum of digits gives 1728317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1728319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 864158 + 864159.

It is an arithmetic number, because the mean of its divisors is an integer number (864159).

2^1728317 is an apocalyptic number.

It is an amenable number.

1728317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1728317 is an equidigital number, since it uses as much as digits as its factorization.

1728317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2352, while the sum is 29.

The square root of 1728317 is about 1314.6547075183. The cubic root of 1728317 is about 120.0073375143.

The spelling of 1728317 in words is "one million, seven hundred twenty-eight thousand, three hundred seventeen".