1091728 has 20 divisors (see below), whose sum is σ = 2307888. Its totient is φ = 496160.

The previous prime is 1091711. The next prime is 1091729. The reversal of 1091728 is 8271901.

It is a junction number, because it is equal to n+sod(n) for n = 1091696 and 1091705.

It is not an unprimeable number, because it can be changed into a prime (1091729) 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, 2926 + ... + 3277.

2^1091728 is an apocalyptic number.

1091728 is the 559-th centered heptagonal number.

It is an amenable number.

1091728 is an abundant number, since it is smaller than the sum of its proper divisors (1216160).

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

1091728 is a wasteful number, since it uses less digits than its factorization.

1091728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6222 (or 6216 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 1091728 is about 1044.8578850734. The cubic root of 1091728 is about 102.9686019860.

The spelling of 1091728 in words is "one million, ninety-one thousand, seven hundred twenty-eight".