1128789 has 16 divisors (see below), whose sum is σ = 1693440. Its totient is φ = 743040.

The previous prime is 1128781. The next prime is 1128811. The reversal of 1128789 is 9878211.

It is not a de Polignac number, because 1128789 - 2³ = 1128781 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2404 + ... + 2834.

It is an arithmetic number, because the mean of its divisors is an integer number (105840).

2^1128789 is an apocalyptic number.

It is an amenable number.

1128789 is a deficient number, since it is larger than the sum of its proper divisors (564651).

1128789 is an equidigital number, since it uses as much as digits as its factorization.

1128789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537 (or 531 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 1128789 is about 1062.4448220967. Note that the first 3 decimals coincide. The cubic root of 1128789 is about 104.1208223511.

Subtracting from 1128789 its sum of digits (36), we obtain a triangular number (1128753 = T₁₅₀₂).

The spelling of 1128789 in words is "one million, one hundred twenty-eight thousand, seven hundred eighty-nine".