3000821 has 2 divisors, whose sum is σ = 3000822. Its totient is φ = 3000820.

The previous prime is 3000797. The next prime is 3000847. The reversal of 3000821 is 1280003.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2992900 + 7921 = 1730^2 + 89^2 .

It is a cyclic number.

It is not a de Polignac number, because 3000821 - 2⁶ = 3000757 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3000796 and 3000805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3003821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1500410 + 1500411.

It is an arithmetic number, because the mean of its divisors is an integer number (1500411).

Almost surely, 2^3000821 is an apocalyptic number.

It is an amenable number.

3000821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3000821 is an equidigital number, since it uses as much as digits as its factorization.

3000821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 3000821 is about 1732.2877936417. The cubic root of 3000821 is about 144.2381123518.

Adding to 3000821 its reverse (1280003), we get a palindrome (4280824).

The spelling of 3000821 in words is "three million, eight hundred twenty-one", and thus it is an aban number.