1128685 has 8 divisors (see below), whose sum is σ = 1391256. Its totient is φ = 878400.

The previous prime is 1128667. The next prime is 1128691. The reversal of 1128685 is 5868211.

It can be written as a sum of positive squares in 4 ways, for example, as 376996 + 751689 = 614^2 + 867^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1128685 - 2⁷ = 1128557 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 2866 + ... + 3235.

It is an arithmetic number, because the mean of its divisors is an integer number (173907).

2^1128685 is an apocalyptic number.

It is an amenable number.

1128685 is a deficient number, since it is larger than the sum of its proper divisors (262571).

1128685 is an equidigital number, since it uses as much as digits as its factorization.

1128685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6143.

The product of its digits is 3840, while the sum is 31.

The square root of 1128685 is about 1062.3958772510. The cubic root of 1128685 is about 104.1176245588.

The spelling of 1128685 in words is "one million, one hundred twenty-eight thousand, six hundred eighty-five".