1728345 has 8 divisors (see below), whose sum is σ = 2765376. Its totient is φ = 921776.

The previous prime is 1728341. The next prime is 1728361. The reversal of 1728345 is 5438271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1728345 - 2² = 1728341 is a prime.

1728345 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1728341) 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 in 7 ways as a sum of consecutive naturals, for example, 57597 + ... + 57626.

It is an arithmetic number, because the mean of its divisors is an integer number (345672).

2^1728345 is an apocalyptic number.

1728345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1728345 is a deficient number, since it is larger than the sum of its proper divisors (1037031).

1728345 is a wasteful number, since it uses less digits than its factorization.

1728345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115231.

The product of its digits is 6720, while the sum is 30.

The square root of 1728345 is about 1314.6653566593. The cubic root of 1728345 is about 120.0079855797.

The spelling of 1728345 in words is "one million, seven hundred twenty-eight thousand, three hundred forty-five".