1723728 has 20 divisors (see below), whose sum is σ = 4453088. Its totient is φ = 574560.

The previous prime is 1723727. The next prime is 1723747. The reversal of 1723728 is 8273271.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1723695 and 1723704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1723721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17908 + ... + 18003.

2^1723728 is an apocalyptic number.

It is an amenable number.

1723728 is an abundant number, since it is smaller than the sum of its proper divisors (2729360).

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

1723728 is a wasteful number, since it uses less digits than its factorization.

1723728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35922 (or 35916 counting only the distinct ones).

The product of its digits is 4704, while the sum is 30.

The square root of 1723728 is about 1312.9082222303. The cubic root of 1723728 is about 119.9010295072.

Adding to 1723728 its reverse (8273271), we get a palindrome (9996999).

The spelling of 1723728 in words is "one million, seven hundred twenty-three thousand, seven hundred twenty-eight".