1128009 has 4 divisors (see below), whose sum is σ = 1504016. Its totient is φ = 752004.

The previous prime is 1127993. The next prime is 1128031. The reversal of 1128009 is 9008211.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9008211 = 3 ⋅3002737.

It is not a de Polignac number, because 1128009 - 2⁴ = 1127993 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1128089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187999 + ... + 188004.

It is an arithmetic number, because the mean of its divisors is an integer number (376004).

2^1128009 is an apocalyptic number.

It is an amenable number.

1128009 is a deficient number, since it is larger than the sum of its proper divisors (376007).

1128009 is an equidigital number, since it uses as much as digits as its factorization.

1128009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376006.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1128009 is about 1062.0776807748. The cubic root of 1128009 is about 104.0968341197.

The spelling of 1128009 in words is "one million, one hundred twenty-eight thousand, nine".