1321039 has 4 divisors (see below), whose sum is σ = 1340824. Its totient is φ = 1301256.

The previous prime is 1321031. The next prime is 1321063. The reversal of 1321039 is 9301231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9301231 = 1151 ⋅8081.

It is a cyclic number.

It is not a de Polignac number, because 1321039 - 2³ = 1321031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9792 + ... + 9925.

It is an arithmetic number, because the mean of its divisors is an integer number (335206).

2^1321039 is an apocalyptic number.

1321039 is a deficient number, since it is larger than the sum of its proper divisors (19785).

1321039 is an equidigital number, since it uses as much as digits as its factorization.

1321039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19784.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 1321039 is about 1149.3646070764. The cubic root of 1321039 is about 109.7249048844.

The spelling of 1321039 in words is "one million, three hundred twenty-one thousand, thirty-nine".