1728829 has 6 divisors (see below), whose sum is σ = 1824990. Its totient is φ = 1637496.

The previous prime is 1728827. The next prime is 1728871. The reversal of 1728829 is 9288271.

It can be written as a sum of positive squares in only one way, i.e., 1092025 + 636804 = 1045^2 + 798^2 .

It is not a de Polignac number, because 1728829 - 2¹ = 1728827 is a prime.

It is a super-2 number, since 2×1728829² = 5977699422482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728821) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 2034 + ... + 2755.

It is an arithmetic number, because the mean of its divisors is an integer number (304165).

2^1728829 is an apocalyptic number.

1728829 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1728829 is a deficient number, since it is larger than the sum of its proper divisors (96161).

1728829 is an equidigital number, since it uses as much as digits as its factorization.

1728829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4827 (or 4808 counting only the distinct ones).

The product of its digits is 16128, while the sum is 37.

The square root of 1728829 is about 1314.8494210365. The cubic root of 1728829 is about 120.0191867469.

The spelling of 1728829 in words is "one million, seven hundred twenty-eight thousand, eight hundred twenty-nine".