7228729 has 2 divisors, whose sum is σ = 7228730. Its totient is φ = 7228728.

The previous prime is 7228717. The next prime is 7228733. The reversal of 7228729 is 9278227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6620329 + 608400 = 2573^2 + 780^2 .

It is a cyclic number.

It is not a de Polignac number, because 7228729 - 2⁹ = 7228217 is a prime.

7228729 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7228769) 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, 3614364 + 3614365.

It is an arithmetic number, because the mean of its divisors is an integer number (3614365).

Almost surely, 2^7228729 is an apocalyptic number.

It is an amenable number.

7228729 is a deficient number, since it is larger than the sum of its proper divisors (1).

7228729 is an equidigital number, since it uses as much as digits as its factorization.

7228729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 37.

The square root of 7228729 is about 2688.6295765687. The cubic root of 7228729 is about 193.3543651978.

The spelling of 7228729 in words is "seven million, two hundred twenty-eight thousand, seven hundred twenty-nine".