2678321 has 2 divisors, whose sum is σ = 2678322. Its totient is φ = 2678320.

The previous prime is 2678311. The next prime is 2678323. The reversal of 2678321 is 1238762.

It is a happy number.

2678321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2062096 + 616225 = 1436^2 + 785^2 .

It is a cyclic number.

It is not a de Polignac number, because 2678321 - 2¹⁴ = 2661937 is a prime.

Together with 2678323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2678323) 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 as a sum of consecutive naturals, namely, 1339160 + 1339161.

It is an arithmetic number, because the mean of its divisors is an integer number (1339161).

2^2678321 is an apocalyptic number.

It is an amenable number.

2678321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2678321 is an equidigital number, since it uses as much as digits as its factorization.

2678321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 29.

The square root of 2678321 is about 1636.5576677893. The cubic root of 2678321 is about 138.8739778718.

The spelling of 2678321 in words is "two million, six hundred seventy-eight thousand, three hundred twenty-one".