1040821 has 2 divisors, whose sum is σ = 1040822. Its totient is φ = 1040820.

The previous prime is 1040813. The next prime is 1040827. The reversal of 1040821 is 1280401.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 662596 + 378225 = 814^2 + 615^2 .

It is an emirp because it is prime and its reverse (1280401) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1040821 - 2³ = 1040813 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1040795 and 1040804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1040827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 520410 + 520411.

It is an arithmetic number, because the mean of its divisors is an integer number (520411).

2^1040821 is an apocalyptic number.

It is an amenable number.

1040821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1040821 is an equidigital number, since it uses as much as digits as its factorization.

1040821 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1040821 is about 1020.2063516760. The cubic root of 1040821 is about 101.3425937501.

The spelling of 1040821 in words is "one million, forty thousand, eight hundred twenty-one".