1091328 has 108 divisors (see below), whose sum is σ = 3495240. Its totient is φ = 301056.

The previous prime is 1091287. The next prime is 1091329. The reversal of 1091328 is 8231901.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 1091298 and 1091307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37618 + ... + 37646.

2^1091328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1091328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1747620).

1091328 is an abundant number, since it is smaller than the sum of its proper divisors (2403912).

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

1091328 is an equidigital number, since it uses as much as digits as its factorization.

1091328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1091328 is about 1044.6664539459. Note that the first 3 decimals coincide. The cubic root of 1091328 is about 102.9560248385.

The spelling of 1091328 in words is "one million, ninety-one thousand, three hundred twenty-eight".