1128785 has 8 divisors (see below), whose sum is σ = 1548096. Its totient is φ = 774000.

The previous prime is 1128781. The next prime is 1128811. The reversal of 1128785 is 5878211.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1128785 - 2² = 1128781 is a prime.

It is a Duffinian number.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 16091 + ... + 16160.

It is an arithmetic number, because the mean of its divisors is an integer number (193512).

2^1128785 is an apocalyptic number.

It is an amenable number.

1128785 is a deficient number, since it is larger than the sum of its proper divisors (419311).

1128785 is an equidigital number, since it uses as much as digits as its factorization.

1128785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32263.

The product of its digits is 4480, while the sum is 32.

The square root of 1128785 is about 1062.4429396443. The cubic root of 1128785 is about 104.1206993627.

Subtracting from 1128785 its sum of digits (32), we obtain a triangular number (1128753 = T₁₅₀₂).

Adding to 1128785 its product of digits (4480), we get a triangular number (1133265 = T₁₅₀₅).

The spelling of 1128785 in words is "one million, one hundred twenty-eight thousand, seven hundred eighty-five".