1028605 has 4 divisors (see below), whose sum is σ = 1234332. Its totient is φ = 822880.

The previous prime is 1028597. The next prime is 1028617. The reversal of 1028605 is 5068201.

It is a happy number.

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 558009 + 470596 = 747^2 + 686^2 .

It is not a de Polignac number, because 1028605 - 2³ = 1028597 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 an Ulam number.

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, 102856 + ... + 102865.

It is an arithmetic number, because the mean of its divisors is an integer number (308583).

2^1028605 is an apocalyptic number.

It is an amenable number.

1028605 is a deficient number, since it is larger than the sum of its proper divisors (205727).

1028605 is an equidigital number, since it uses as much as digits as its factorization.

1028605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205726.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1028605 is about 1014.2016564767. The cubic root of 1028605 is about 100.9445501598.

The spelling of 1028605 in words is "one million, twenty-eight thousand, six hundred five".