1728398 has 8 divisors (see below), whose sum is σ = 2962992. Its totient is φ = 740736.

The previous prime is 1728361. The next prime is 1728403. The reversal of 1728398 is 8938271.

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

It is a d-powerful number, because it can be written as 1 + 7⁴ + 2¹⁷ + 8 + 3¹³ + 9² + 8³ .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 61715 + ... + 61742.

It is an arithmetic number, because the mean of its divisors is an integer number (370374).

2^1728398 is an apocalyptic number.

1728398 is a deficient number, since it is larger than the sum of its proper divisors (1234594).

1728398 is a wasteful number, since it uses less digits than its factorization.

1728398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123466.

The product of its digits is 24192, while the sum is 38.

The square root of 1728398 is about 1314.6855137256. The cubic root of 1728398 is about 120.0092122557.

The spelling of 1728398 in words is "one million, seven hundred twenty-eight thousand, three hundred ninety-eight".