856729 has 8 divisors (see below), whose sum is σ = 916640. Its totient is φ = 798336.

The previous prime is 856721. The next prime is 856733. The reversal of 856729 is 927658.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 856729 - 2³ = 856721 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

856729 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (856721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 937 + ... + 1609.

It is an arithmetic number, because the mean of its divisors is an integer number (114580).

2⁸⁵⁶⁷²⁹ is an apocalyptic number.

It is an amenable number.

856729 is a deficient number, since it is larger than the sum of its proper divisors (59911).

856729 is a wasteful number, since it uses less digits than its factorization.

856729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759.

The product of its digits is 30240, while the sum is 37.

The square root of 856729 is about 925.5965643843. The cubic root of 856729 is about 94.9761343559.

The spelling of 856729 in words is "eight hundred fifty-six thousand, seven hundred twenty-nine".