4009729 has 2 divisors, whose sum is σ = 4009730. Its totient is φ = 4009728.

The previous prime is 4009721. The next prime is 4009769. The reversal of 4009729 is 9279004.

4009729 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., 2624400 + 1385329 = 1620^2 + 1177^2 .

It is a cyclic number.

It is not a de Polignac number, because 4009729 - 2³ = 4009721 is a prime.

4009729 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 4009729.

It is not a weakly prime, because it can be changed into another prime (4009721) 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, 2004864 + 2004865.

It is an arithmetic number, because the mean of its divisors is an integer number (2004865).

Almost surely, 2^4009729 is an apocalyptic number.

It is an amenable number.

4009729 is a deficient number, since it is larger than the sum of its proper divisors (1).

4009729 is an equidigital number, since it uses as much as digits as its factorization.

4009729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 4009729 is about 2002.4307728359. The cubic root of 4009729 is about 158.8686995355.

The spelling of 4009729 in words is "four million, nine thousand, seven hundred twenty-nine".