1091256 has 32 divisors (see below), whose sum is σ = 2797200. Its totient is φ = 354560.

The previous prime is 1091243. The next prime is 1091257. The reversal of 1091256 is 6521901.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091257) 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, 430 + ... + 1538.

2^1091256 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 1091256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1398600).

1091256 is an abundant number, since it is smaller than the sum of its proper divisors (1705944).

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

1091256 is a wasteful number, since it uses less digits than its factorization.

1091256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1159 (or 1155 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 1091256 is about 1044.6319926175. The cubic root of 1091256 is about 102.9537606256.

The spelling of 1091256 in words is "one million, ninety-one thousand, two hundred fifty-six".