1028609 has 4 divisors (see below), whose sum is σ = 1030704. Its totient is φ = 1026516.

The previous prime is 1028597. The next prime is 1028617. The reversal of 1028609 is 9068201.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1028609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1028669) 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, 134 + ... + 1440.

It is an arithmetic number, because the mean of its divisors is an integer number (257676).

2^1028609 is an apocalyptic number.

It is an amenable number.

1028609 is a deficient number, since it is larger than the sum of its proper divisors (2095).

1028609 is an equidigital number, since it uses as much as digits as its factorization.

1028609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2094.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1028609 is about 1014.2036284692. The cubic root of 1028609 is about 100.9446810094.

The spelling of 1028609 in words is "one million, twenty-eight thousand, six hundred nine".