1728242 has 4 divisors (see below), whose sum is σ = 2592366. Its totient is φ = 864120.

The previous prime is 1728229. The next prime is 1728247. The reversal of 1728242 is 2428271.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1164241 + 564001 = 1079^2 + 751^2 .

It is not an unprimeable number, because it can be changed into a prime (1728247) 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 as a sum of consecutive naturals, namely, 432059 + ... + 432062.

2^1728242 is an apocalyptic number.

1728242 is a deficient number, since it is larger than the sum of its proper divisors (864124).

1728242 is an equidigital number, since it uses as much as digits as its factorization.

1728242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864123.

The product of its digits is 1792, while the sum is 26.

The square root of 1728242 is about 1314.6261826086. The cubic root of 1728242 is about 120.0056015904.

The spelling of 1728242 in words is "one million, seven hundred twenty-eight thousand, two hundred forty-two".