1155128 has 32 divisors (see below), whose sum is σ = 2419200. Its totient is φ = 513408.

The previous prime is 1155127. The next prime is 1155149. The reversal of 1155128 is 8215511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155127) 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 7 ways as a sum of consecutive naturals, for example, 2825 + ... + 3207.

It is an arithmetic number, because the mean of its divisors is an integer number (75600).

2^1155128 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 1155128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1209600).

1155128 is an abundant number, since it is smaller than the sum of its proper divisors (1264072).

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

1155128 is a wasteful number, since it uses less digits than its factorization.

1155128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 427 counting only the distinct ones).

The product of its digits is 400, while the sum is 23.

The square root of 1155128 is about 1074.7688123499. The cubic root of 1155128 is about 104.9244505669.

The spelling of 1155128 in words is "one million, one hundred fifty-five thousand, one hundred twenty-eight".