1128005 has 4 divisors (see below), whose sum is σ = 1353612. Its totient is φ = 902400.

The previous prime is 1127993. The next prime is 1128031. The reversal of 1128005 is 5008211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 145924 + 982081 = 382^2 + 991^2 .

It is not a de Polignac number, because 1128005 - 2¹² = 1123909 is a prime.

It is a Duffinian 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, 112796 + ... + 112805.

It is an arithmetic number, because the mean of its divisors is an integer number (338403).

2^1128005 is an apocalyptic number.

It is an amenable number.

1128005 is a deficient number, since it is larger than the sum of its proper divisors (225607).

1128005 is an equidigital number, since it uses as much as digits as its factorization.

1128005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225606.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 1128005 is about 1062.0757976717. The cubic root of 1128005 is about 104.0967110746.

The spelling of 1128005 in words is "one million, one hundred twenty-eight thousand, five".