1125805 has 4 divisors (see below), whose sum is σ = 1350972. Its totient is φ = 900640.

The previous prime is 1125797. The next prime is 1125811. The reversal of 1125805 is 5085211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5085211 = 179 ⋅28409.

It can be written as a sum of positive squares in 2 ways, for example, as 121801 + 1004004 = 349^2 + 1002^2 .

It is not a de Polignac number, because 1125805 - 2³ = 1125797 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 112576 + ... + 112585.

It is an arithmetic number, because the mean of its divisors is an integer number (337743).

2^1125805 is an apocalyptic number.

It is an amenable number.

1125805 is a deficient number, since it is larger than the sum of its proper divisors (225167).

1125805 is an equidigital number, since it uses as much as digits as its factorization.

1125805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225166.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 1125805 is about 1061.0395845585. The cubic root of 1125805 is about 104.0289921636.

The spelling of 1125805 in words is "one million, one hundred twenty-five thousand, eight hundred five".