1028809 has 2 divisors, whose sum is σ = 1028810. Its totient is φ = 1028808.

The previous prime is 1028803. The next prime is 1028837. The reversal of 1028809 is 9088201.

It is an a-pointer prime, because the next prime (1028837) can be obtained adding 1028809 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 672400 + 356409 = 820^2 + 597^2 .

It is a cyclic number.

It is not a de Polignac number, because 1028809 - 2⁵ = 1028777 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1028803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 514404 + 514405.

It is an arithmetic number, because the mean of its divisors is an integer number (514405).

2^1028809 is an apocalyptic number.

It is an amenable number.

1028809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1028809 is an equidigital number, since it uses as much as digits as its factorization.

1028809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 1028809 is about 1014.3022232057. The cubic root of 1028809 is about 100.9512230573.

It can be divided in two parts, 102 and 8809, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 1028809 in words is "one million, twenty-eight thousand, eight hundred nine".