1728236 has 6 divisors (see below), whose sum is σ = 3024420. Its totient is φ = 864116.

The previous prime is 1728229. The next prime is 1728247. The reversal of 1728236 is 6328271.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1728199 and 1728208.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 216026 + ... + 216033.

It is an arithmetic number, because the mean of its divisors is an integer number (504070).

2^1728236 is an apocalyptic number.

It is an amenable number.

1728236 is a deficient number, since it is larger than the sum of its proper divisors (1296184).

1728236 is a wasteful number, since it uses less digits than its factorization.

1728236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432063 (or 432061 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 1728236 is about 1314.6239005891. The cubic root of 1728236 is about 120.0054627143.

The spelling of 1728236 in words is "one million, seven hundred twenty-eight thousand, two hundred thirty-six".