2773721 has 2 divisors, whose sum is σ = 2773722. Its totient is φ = 2773720.

The previous prime is 2773699. The next prime is 2773747. The reversal of 2773721 is 1273772.

2773721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1795600 + 978121 = 1340^2 + 989^2 .

It is a cyclic number.

It is not a de Polignac number, because 2773721 - 2⁶ = 2773657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2773021) 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, 1386860 + 1386861.

It is an arithmetic number, because the mean of its divisors is an integer number (1386861).

2^2773721 is an apocalyptic number.

It is an amenable number.

2773721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2773721 is an equidigital number, since it uses as much as digits as its factorization.

2773721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4116, while the sum is 29.

The square root of 2773721 is about 1665.4491886575. The cubic root of 2773721 is about 140.5036451649.

The spelling of 2773721 in words is "two million, seven hundred seventy-three thousand, seven hundred twenty-one".