1728789 has 8 divisors (see below), whose sum is σ = 2319072. Its totient is φ = 1145520.

The previous prime is 1728773. The next prime is 1728809. The reversal of 1728789 is 9878271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1728789 - 2⁴ = 1728773 is a prime.

It is a super-2 number, since 2×1728789² = 5977422813042, which contains 22 as substring.

1728789 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1728789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1147 + ... + 2184.

It is an arithmetic number, because the mean of its divisors is an integer number (289884).

2^1728789 is an apocalyptic number.

It is an amenable number.

1728789 is a deficient number, since it is larger than the sum of its proper divisors (590283).

1728789 is a wasteful number, since it uses less digits than its factorization.

1728789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3507.

The product of its digits is 56448, while the sum is 42.

The square root of 1728789 is about 1314.8342100813. The cubic root of 1728789 is about 120.0182611098.

The spelling of 1728789 in words is "one million, seven hundred twenty-eight thousand, seven hundred eighty-nine".