1728206 has 4 divisors (see below), whose sum is σ = 2592312. Its totient is φ = 864102.

The previous prime is 1728193. The next prime is 1728229. The reversal of 1728206 is 6028271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6028271 = 41 ⋅147031.

It is a Curzon number.

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 as a sum of consecutive naturals, namely, 432050 + ... + 432053.

It is an arithmetic number, because the mean of its divisors is an integer number (648078).

2^1728206 is an apocalyptic number.

1728206 is a deficient number, since it is larger than the sum of its proper divisors (864106).

1728206 is an equidigital number, since it uses as much as digits as its factorization.

1728206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864105.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 1728206 is about 1314.6124904321. The cubic root of 1728206 is about 120.0047683290.

The spelling of 1728206 in words is "one million, seven hundred twenty-eight thousand, two hundred six".