1728222 has 16 divisors (see below), whose sum is σ = 3488400. Its totient is φ = 570752.

The previous prime is 1728193. The next prime is 1728229. The reversal of 1728222 is 2228271.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1728192 and 1728201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728229) 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, 597 + ... + 1952.

It is an arithmetic number, because the mean of its divisors is an integer number (218025).

2^1728222 is an apocalyptic number.

1728222 is an abundant number, since it is smaller than the sum of its proper divisors (1760178).

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

1728222 is a wasteful number, since it uses less digits than its factorization.

1728222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2667.

The product of its digits is 896, while the sum is 24.

The square root of 1728222 is about 1314.6185758615. The cubic root of 1728222 is about 120.0051386688.

The spelling of 1728222 in words is "one million, seven hundred twenty-eight thousand, two hundred twenty-two".