1028001289 has 12 divisors (see below), whose sum is σ = 1239950784. Its totient is φ = 834765912.

The previous prime is 1028001287. The next prime is 1028001319. The reversal of 1028001289 is 9821008201.

It is a happy number.

It is not a de Polignac number, because 1028001289 - 2¹ = 1028001287 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1028001289.

It is not an unprimeable number, because it can be changed into a prime (1028001281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 200877 + ... + 205930.

It is an arithmetic number, because the mean of its divisors is an integer number (103329232).

Almost surely, 2^1028001289 is an apocalyptic number.

1028001289 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1028001289 is a deficient number, since it is larger than the sum of its proper divisors (211949495).

1028001289 is an equidigital number, since it uses as much as digits as its factorization.

1028001289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406852 (or 406833 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 1028001289 is about 32062.4591851592. The cubic root of 1028001289 is about 1009.2479743264.

The spelling of 1028001289 in words is "one billion, twenty-eight million, one thousand, two hundred eighty-nine".