6928021 has 2 divisors, whose sum is σ = 6928022. Its totient is φ = 6928020.

The previous prime is 6928003. The next prime is 6928043. The reversal of 6928021 is 1208296.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3651921 + 3276100 = 1911^2 + 1810^2 .

It is a cyclic number.

It is not a de Polignac number, because 6928021 - 2⁹ = 6927509 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6928091) 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, 3464010 + 3464011.

It is an arithmetic number, because the mean of its divisors is an integer number (3464011).

Almost surely, 2^6928021 is an apocalyptic number.

It is an amenable number.

6928021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6928021 is an equidigital number, since it uses as much as digits as its factorization.

6928021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 6928021 is about 2632.1134094108. The cubic root of 6928021 is about 190.6351871650.

The spelling of 6928021 in words is "six million, nine hundred twenty-eight thousand, twenty-one".