6857729 has 2 divisors, whose sum is σ = 6857730. Its totient is φ = 6857728.

The previous prime is 6857713. The next prime is 6857743. The reversal of 6857729 is 9277586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3534400 + 3323329 = 1880^2 + 1823^2 .

It is a cyclic number.

It is not a de Polignac number, because 6857729 - 2⁴ = 6857713 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6857729.

It is not a weakly prime, because it can be changed into another prime (6857759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3428864 + 3428865.

It is an arithmetic number, because the mean of its divisors is an integer number (3428865).

Almost surely, 2^6857729 is an apocalyptic number.

It is an amenable number.

6857729 is a deficient number, since it is larger than the sum of its proper divisors (1).

6857729 is an equidigital number, since it uses as much as digits as its factorization.

6857729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 44.

The square root of 6857729 is about 2618.7265989408. The cubic root of 6857729 is about 189.9882633563.

The spelling of 6857729 in words is "six million, eight hundred fifty-seven thousand, seven hundred twenty-nine".