1728026 has 4 divisors (see below), whose sum is σ = 2592042. Its totient is φ = 864012.

The previous prime is 1728019. The next prime is 1728043. The reversal of 1728026 is 6208271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6208271 = 2143 ⋅2897.

It can be written as a sum of positive squares in only one way, i.e., 1324801 + 403225 = 1151^2 + 635^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1727986 and 1728004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432005 + ... + 432008.

2^1728026 is an apocalyptic number.

1728026 is a deficient number, since it is larger than the sum of its proper divisors (864016).

1728026 is an equidigital number, since it uses as much as digits as its factorization.

1728026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864015.

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

The square root of 1728026 is about 1314.5440274103. The cubic root of 1728026 is about 120.0006018488. Note that the first 3 decimals are identical.

Subtracting from 1728026 its sum of digits (26), we obtain a cube (1728000 = 120³).

The spelling of 1728026 in words is "one million, seven hundred twenty-eight thousand, twenty-six".