2724721 has 2 divisors, whose sum is σ = 2724722. Its totient is φ = 2724720.

The previous prime is 2724719. The next prime is 2724727. The reversal of 2724721 is 1274272.

2724721 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., 2250000 + 474721 = 1500^2 + 689^2 .

It is a cyclic number.

It is not a de Polignac number, because 2724721 - 2¹ = 2724719 is a prime.

Together with 2724719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2724727) 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, 1362360 + 1362361.

It is an arithmetic number, because the mean of its divisors is an integer number (1362361).

2^2724721 is an apocalyptic number.

It is an amenable number.

2724721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2724721 is an equidigital number, since it uses as much as digits as its factorization.

2724721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1568, while the sum is 25.

The square root of 2724721 is about 1650.6728930954. The cubic root of 2724721 is about 139.6713549715.

Adding to 2724721 its reverse (1274272), we get a palindrome (3998993).

The spelling of 2724721 in words is "two million, seven hundred twenty-four thousand, seven hundred twenty-one".