1000321 has 4 divisors (see below), whose sum is σ = 1143232. Its totient is φ = 857412.

The previous prime is 1000313. The next prime is 1000333. The reversal of 1000321 is 1230001.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1230001 = 17 ⋅72353.

It is a cyclic number.

It is not a de Polignac number, because 1000321 - 2³ = 1000313 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7), and also a Moran number because the ratio is a prime number: 142903 = 1000321 / (1 + 0 + 0 + 0 + 3 + 2 + 1).

It is a Duffinian number.

1000321 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000381) 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, 71445 + ... + 71458.

It is an arithmetic number, because the mean of its divisors is an integer number (285808).

2^1000321 is an apocalyptic number.

It is an amenable number.

1000321 is a deficient number, since it is larger than the sum of its proper divisors (142911).

1000321 is an equidigital number, since it uses as much as digits as its factorization.

1000321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142910.

The product of its (nonzero) digits is 6, while the sum is 7.

The square root of 1000321 is about 1000.1604871219. The cubic root of 1000321 is about 100.0106988553.

Adding to 1000321 its reverse (1230001), we get a palindrome (2230322).

The spelling of 1000321 in words is "one million, three hundred twenty-one", and thus it is an aban number.