1728323 has 2 divisors, whose sum is σ = 1728324. Its totient is φ = 1728322.

The previous prime is 1728319. The next prime is 1728329. The reversal of 1728323 is 3238271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1728323 - 2² = 1728319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1728292 and 1728301.

It is not a weakly prime, because it can be changed into another prime (1728329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 864161 + 864162.

It is an arithmetic number, because the mean of its divisors is an integer number (864162).

2^1728323 is an apocalyptic number.

1728323 is a deficient number, since it is larger than the sum of its proper divisors (1).

1728323 is an equidigital number, since it uses as much as digits as its factorization.

1728323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 26.

The square root of 1728323 is about 1314.6569894843. The cubic root of 1728323 is about 120.0074763860.

The spelling of 1728323 in words is "one million, seven hundred twenty-eight thousand, three hundred twenty-three".