1728243 has 36 divisors (see below), whose sum is σ = 2941960. Its totient is φ = 1001880.

The previous prime is 1728229. The next prime is 1728247. The reversal of 1728243 is 3428271.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 1728243 - 2⁶ = 1728179 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1728247) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 75130 + ... + 75152.

2^1728243 is an apocalyptic number.

1728243 is a deficient number, since it is larger than the sum of its proper divisors (1213717).

1728243 is a wasteful number, since it uses less digits than its factorization.

1728243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77 (or 37 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 1728243 is about 1314.6265629448. The cubic root of 1728243 is about 120.0056247363.

Multiplying 1728243 by its sum of digits (27), we get a square (46662561 = 6831²).

1728243 divided by its sum of digits (27) gives a square (64009 = 253²).

It can be divided in two parts, 1728 and 243, that multiplied together give a square (419904 = 648²).

The spelling of 1728243 in words is "one million, seven hundred twenty-eight thousand, two hundred forty-three".