1028389 has 2 divisors, whose sum is σ = 1028390. Its totient is φ = 1028388.

The previous prime is 1028333. The next prime is 1028393. The reversal of 1028389 is 9838201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 616225 + 412164 = 785^2 + 642^2 .

It is a cyclic number.

It is not a de Polignac number, because 1028389 - 2¹⁷ = 897317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1028389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1028309) by changing a digit.

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 as a sum of consecutive naturals, namely, 514194 + 514195.

It is an arithmetic number, because the mean of its divisors is an integer number (514195).

2^1028389 is an apocalyptic number.

It is an amenable number.

1028389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1028389 is an equidigital number, since it uses as much as digits as its factorization.

1028389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 1028389 is about 1014.0951631874. The cubic root of 1028389 is about 100.9374837773.

The spelling of 1028389 in words is "one million, twenty-eight thousand, three hundred eighty-nine".