1321004 has 12 divisors (see below), whose sum is σ = 2330328. Its totient is φ = 655200.

The previous prime is 1320983. The next prime is 1321007. The reversal of 1321004 is 4001231.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1321007) 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, 737 + ... + 1784.

It is an arithmetic number, because the mean of its divisors is an integer number (194194).

2^1321004 is an apocalyptic number.

It is an amenable number.

1321004 is a deficient number, since it is larger than the sum of its proper divisors (1009324).

1321004 is a wasteful number, since it uses less digits than its factorization.

1321004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2656 (or 2654 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1321004 is about 1149.3493811718. The cubic root of 1321004 is about 109.7239358477.

Adding to 1321004 its reverse (4001231), we get a palindrome (5322235).

The spelling of 1321004 in words is "one million, three hundred twenty-one thousand, four".