1289321 has 16 divisors (see below), whose sum is σ = 1536000. Its totient is φ = 1069200.

The previous prime is 1289303. The next prime is 1289329. The reversal of 1289321 is 1239821.

It is not a de Polignac number, because 1289321 - 2¹⁴ = 1272937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1289329) 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 in 15 ways as a sum of consecutive naturals, for example, 6380 + ... + 6578.

It is an arithmetic number, because the mean of its divisors is an integer number (96000).

2^1289321 is an apocalyptic number.

1289321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1289321 is a deficient number, since it is larger than the sum of its proper divisors (246679).

1289321 is a wasteful number, since it uses less digits than its factorization.

1289321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260.

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

The square root of 1289321 is about 1135.4827167333. The cubic root of 1289321 is about 108.8396204912.

It can be divided in two parts, 128 and 9321, that added together give a palindrome (9449).

The spelling of 1289321 in words is "one million, two hundred eighty-nine thousand, three hundred twenty-one".