1128389 has 4 divisors (see below), whose sum is σ = 1158924. Its totient is φ = 1097856.

The previous prime is 1128383. The next prime is 1128397. The reversal of 1128389 is 9838211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9838211 = 659 ⋅14929.

It can be written as a sum of positive squares in 2 ways, for example, as 940900 + 187489 = 970^2 + 433^2 .

It is a cyclic number.

It is not a de Polignac number, because 1128389 - 2⁴ = 1128373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15212 + ... + 15285.

It is an arithmetic number, because the mean of its divisors is an integer number (289731).

2^1128389 is an apocalyptic number.

It is an amenable number.

1128389 is a deficient number, since it is larger than the sum of its proper divisors (30535).

1128389 is an equidigital number, since it uses as much as digits as its factorization.

1128389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30534.

The product of its digits is 3456, while the sum is 32.

The square root of 1128389 is about 1062.2565603469. The cubic root of 1128389 is about 104.1085220749.

The spelling of 1128389 in words is "one million, one hundred twenty-eight thousand, three hundred eighty-nine".