1728079 has 4 divisors (see below), whose sum is σ = 1731184. Its totient is φ = 1724976.

The previous prime is 1728071. The next prime is 1728091. The reversal of 1728079 is 9708271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9708271 = 1129 ⋅8599.

It is a 4-Lehmer number, since φ(1728079) divides (1728079-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 1728079 - 2³ = 1728071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728071) 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 3 ways as a sum of consecutive naturals, for example, 462 + ... + 1915.

It is an arithmetic number, because the mean of its divisors is an integer number (432796).

2^1728079 is an apocalyptic number.

1728079 is a deficient number, since it is larger than the sum of its proper divisors (3105).

1728079 is an equidigital number, since it uses as much as digits as its factorization.

1728079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3104.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 1728079 is about 1314.5641863371. The cubic root of 1728079 is about 120.0018286758.

The spelling of 1728079 in words is "one million, seven hundred twenty-eight thousand, seventy-nine".