1728645 has 16 divisors (see below), whose sum is σ = 2928960. Its totient is φ = 867584.

The previous prime is 1728593. The next prime is 1728659. The reversal of 1728645 is 5468271.

It is a cyclic number.

It is not a de Polignac number, because 1728645 - 2⁶ = 1728581 is a prime.

It is a d-powerful number, because it can be written as 1 + 7⁷ + 2¹⁹ + 8⁵ + 6⁵ + 4⁹ + 5⁷ .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3135 + ... + 3644.

It is an arithmetic number, because the mean of its divisors is an integer number (183060).

2^1728645 is an apocalyptic number.

1728645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1728645 is a deficient number, since it is larger than the sum of its proper divisors (1200315).

1728645 is a wasteful number, since it uses less digits than its factorization.

1728645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6804.

The product of its digits is 13440, while the sum is 33.

The square root of 1728645 is about 1314.7794491853. The cubic root of 1728645 is about 120.0149286983.

The spelling of 1728645 in words is "one million, seven hundred twenty-eight thousand, six hundred forty-five".