2729729 has 2 divisors, whose sum is σ = 2729730. Its totient is φ = 2729728.

The previous prime is 2729723. The next prime is 2729747. The reversal of 2729729 is 9279272.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2729104 + 625 = 1652^2 + 25^2 .

It is a cyclic number.

It is not a de Polignac number, because 2729729 - 2⁸ = 2729473 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2729692 and 2729701.

It is not a weakly prime, because it can be changed into another prime (2729723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1364864 + 1364865.

It is an arithmetic number, because the mean of its divisors is an integer number (1364865).

2^2729729 is an apocalyptic number.

It is an amenable number.

2729729 is a deficient number, since it is larger than the sum of its proper divisors (1).

2729729 is an equidigital number, since it uses as much as digits as its factorization.

2729729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 38.

The square root of 2729729 is about 1652.1891538199. The cubic root of 2729729 is about 139.7568739465.

It can be divided in two parts, 272 and 9729, that added together give a palindrome (10001).

The spelling of 2729729 in words is "two million, seven hundred twenty-nine thousand, seven hundred twenty-nine".