1091232 has 60 divisors (see below), whose sum is σ = 3216906. Its totient is φ = 362880.

The previous prime is 1091221. The next prime is 1091239. The reversal of 1091232 is 2321901.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1089936 + 1296 = 1044^2 + 36^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1091239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2382 + ... + 2802.

2^1091232 is an apocalyptic number.

1091232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1091232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1608453).

1091232 is an abundant number, since it is smaller than the sum of its proper divisors (2125674).

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

1091232 is an equidigital number, since it uses as much as digits as its factorization.

1091232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 1091232 is about 1044.6205052554. The cubic root of 1091232 is about 102.9530058659.

The spelling of 1091232 in words is "one million, ninety-one thousand, two hundred thirty-two".