1128845 has 4 divisors (see below), whose sum is σ = 1354620. Its totient is φ = 903072.

The previous prime is 1128823. The next prime is 1128889. The reversal of 1128845 is 5488211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5488211 = 281 ⋅19531.

It can be written as a sum of positive squares in 2 ways, for example, as 879844 + 249001 = 938^2 + 499^2 .

It is a cyclic number.

It is not a de Polignac number, because 1128845 - 2⁶ = 1128781 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112880 + ... + 112889.

It is an arithmetic number, because the mean of its divisors is an integer number (338655).

2^1128845 is an apocalyptic number.

It is an amenable number.

1128845 is a deficient number, since it is larger than the sum of its proper divisors (225775).

1128845 is an equidigital number, since it uses as much as digits as its factorization.

1128845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225774.

The product of its digits is 2560, while the sum is 29.

The square root of 1128845 is about 1062.4711760796. The cubic root of 1128845 is about 104.1225441578.

The spelling of 1128845 in words is "one million, one hundred twenty-eight thousand, eight hundred forty-five".