4247729 has 2 divisors, whose sum is σ = 4247730. Its totient is φ = 4247728.

The previous prime is 4247707. The next prime is 4247741. The reversal of 4247729 is 9277424.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3508129 + 739600 = 1873^2 + 860^2 .

It is a cyclic number.

It is not a de Polignac number, because 4247729 - 2¹² = 4243633 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 4⁵ + 2¹¹ + 4¹¹ + 7² + 7⁵ + 2¹⁵ + 9³ .

It is not a weakly prime, because it can be changed into another prime (4247759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2123864 + 2123865.

It is an arithmetic number, because the mean of its divisors is an integer number (2123865).

Almost surely, 2^4247729 is an apocalyptic number.

It is an amenable number.

4247729 is a deficient number, since it is larger than the sum of its proper divisors (1).

4247729 is an equidigital number, since it uses as much as digits as its factorization.

4247729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 35.

The square root of 4247729 is about 2061.0019408045. The cubic root of 4247729 is about 161.9517333218.

The spelling of 4247729 in words is "four million, two hundred forty-seven thousand, seven hundred twenty-nine".