3028721 has 2 divisors, whose sum is σ = 3028722. Its totient is φ = 3028720.

The previous prime is 3028699. The next prime is 3028747. The reversal of 3028721 is 1278203.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3010225 + 18496 = 1735^2 + 136^2 .

It is an emirp because it is prime and its reverse (1278203) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3028721 - 2¹⁴ = 3012337 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3028021) 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, 1514360 + 1514361.

It is an arithmetic number, because the mean of its divisors is an integer number (1514361).

Almost surely, 2^3028721 is an apocalyptic number.

It is an amenable number.

3028721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3028721 is an equidigital number, since it uses as much as digits as its factorization.

3028721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 3028721 is about 1740.3220966246. The cubic root of 3028721 is about 144.6837499086.

The spelling of 3028721 in words is "three million, twenty-eight thousand, seven hundred twenty-one".