1128189 has 4 divisors (see below), whose sum is σ = 1504256. Its totient is φ = 752124.

The previous prime is 1128181. The next prime is 1128209. The reversal of 1128189 is 9818211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1128189 - 2³ = 1128181 is a prime.

It is a D-number.

It is a Duffinian 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 (1128181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188029 + ... + 188034.

It is an arithmetic number, because the mean of its divisors is an integer number (376064).

2^1128189 is an apocalyptic number.

It is an amenable number.

1128189 is a deficient number, since it is larger than the sum of its proper divisors (376067).

1128189 is an equidigital number, since it uses as much as digits as its factorization.

1128189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376066.

The product of its digits is 1152, while the sum is 30.

The square root of 1128189 is about 1062.1624169589. The cubic root of 1128189 is about 104.1023708467.

The spelling of 1128189 in words is "one million, one hundred twenty-eight thousand, one hundred eighty-nine".