1728329 has 2 divisors, whose sum is σ = 1728330. Its totient is φ = 1728328.

The previous prime is 1728323. The next prime is 1728341. The reversal of 1728329 is 9238271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1428025 + 300304 = 1195^2 + 548^2 .

It is a cyclic number.

It is not a de Polignac number, because 1728329 - 2²⁰ = 679753 is a prime.

It is a super-2 number, since 2×1728329² = 5974242264482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1728295 and 1728304.

It is not a weakly prime, because it can be changed into another prime (1728323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 864164 + 864165.

It is an arithmetic number, because the mean of its divisors is an integer number (864165).

2^1728329 is an apocalyptic number.

It is an amenable number.

1728329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1728329 is an equidigital number, since it uses as much as digits as its factorization.

1728329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 32.

The square root of 1728329 is about 1314.6592714464. The cubic root of 1728329 is about 120.0076152575.

The spelling of 1728329 in words is "one million, seven hundred twenty-eight thousand, three hundred twenty-nine".