1004821 has 4 divisors (see below), whose sum is σ = 1039500. Its totient is φ = 970144.

The previous prime is 1004797. The next prime is 1004873. The reversal of 1004821 is 1284001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1284001 = 19 ⋅67579.

It can be written as a sum of positive squares in 2 ways, for example, as 342225 + 662596 = 585^2 + 814^2 .

It is a cyclic number.

It is not a de Polignac number, because 1004821 - 2¹¹ = 1002773 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1004795 and 1004804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1004221) 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 3 ways as a sum of consecutive naturals, for example, 17296 + ... + 17353.

It is an arithmetic number, because the mean of its divisors is an integer number (259875).

2^1004821 is an apocalyptic number.

It is an amenable number.

1004821 is a deficient number, since it is larger than the sum of its proper divisors (34679).

1004821 is an equidigital number, since it uses as much as digits as its factorization.

1004821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34678.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1004821 is about 1002.4076017270. The cubic root of 1004821 is about 100.1604424446.

Adding to 1004821 its reverse (1284001), we get a palindrome (2288822).

The spelling of 1004821 in words is "one million, four thousand, eight hundred twenty-one".