1728213 has 8 divisors (see below), whose sum is σ = 2358048. Its totient is φ = 1125264.

The previous prime is 1728193. The next prime is 1728229. The reversal of 1728213 is 3128271.

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

It is not a de Polignac number, because 1728213 - 2⁶ = 1728149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728253) 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 in 7 ways as a sum of consecutive naturals, for example, 6570 + ... + 6827.

It is an arithmetic number, because the mean of its divisors is an integer number (294756).

2^1728213 is an apocalyptic number.

It is an amenable number.

1728213 is a deficient number, since it is larger than the sum of its proper divisors (629835).

1728213 is a wasteful number, since it uses less digits than its factorization.

1728213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13443.

The product of its digits is 672, while the sum is 24.

The square root of 1728213 is about 1314.6151528109. The cubic root of 1728213 is about 120.0049303530.

It can be divided in two parts, 172 and 8213, that added together give a triangular number (8385 = T₁₂₉).

The spelling of 1728213 in words is "one million, seven hundred twenty-eight thousand, two hundred thirteen".