1728444 has 12 divisors (see below), whose sum is σ = 4033064. Its totient is φ = 576144.

The previous prime is 1728439. The next prime is 1728451. The reversal of 1728444 is 4448271.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1728444² = 5975037322272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72007 + ... + 72030.

2^1728444 is an apocalyptic number.

It is an amenable number.

1728444 is an abundant number, since it is smaller than the sum of its proper divisors (2304620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1728444 is a wasteful number, since it uses less digits than its factorization.

1728444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144044 (or 144042 counting only the distinct ones).

The product of its digits is 7168, while the sum is 30.

The square root of 1728444 is about 1314.7030082874. The cubic root of 1728444 is about 120.0102768976.

The spelling of 1728444 in words is "one million, seven hundred twenty-eight thousand, four hundred forty-four".