1328289 has 4 divisors (see below), whose sum is σ = 1771056. Its totient is φ = 885524.

The previous prime is 1328279. The next prime is 1328297. The reversal of 1328289 is 9828231.

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 not a de Polignac number, because 1328289 - 2⁷ = 1328161 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1328219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221379 + ... + 221384.

It is an arithmetic number, because the mean of its divisors is an integer number (442764).

2^1328289 is an apocalyptic number.

It is an amenable number.

1328289 is a deficient number, since it is larger than the sum of its proper divisors (442767).

1328289 is an equidigital number, since it uses as much as digits as its factorization.

1328289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442766.

The product of its digits is 6912, while the sum is 33.

The square root of 1328289 is about 1152.5142081554. The cubic root of 1328289 is about 109.9252660417.

The spelling of 1328289 in words is "one million, three hundred twenty-eight thousand, two hundred eighty-nine".