2840729 has 4 divisors (see below), whose sum is σ = 2846820. Its totient is φ = 2834640.

The previous prime is 2840723. The next prime is 2840731. The reversal of 2840729 is 9270482.

2840729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1630729 + 1210000 = 1277^2 + 1100^2 .

It is a cyclic number.

It is not a de Polignac number, because 2840729 - 2¹² = 2836633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2840695 and 2840704.

It is not an unprimeable number, because it can be changed into a prime (2840723) 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 in 3 ways as a sum of consecutive naturals, for example, 2282 + ... + 3299.

It is an arithmetic number, because the mean of its divisors is an integer number (711705).

2^2840729 is an apocalyptic number.

It is an amenable number.

2840729 is a deficient number, since it is larger than the sum of its proper divisors (6091).

2840729 is an equidigital number, since it uses as much as digits as its factorization.

2840729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6090.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 2840729 is about 1685.4462317143. The cubic root of 2840729 is about 141.6260909555.

The spelling of 2840729 in words is "two million, eight hundred forty thousand, seven hundred twenty-nine".