856555 has 8 divisors (see below), whose sum is σ = 1174752. Its totient is φ = 587328.

The previous prime is 856553. The next prime is 856567. The reversal of 856555 is 555658.

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

It is not a de Polignac number, because 856555 - 2¹ = 856553 is a prime.

It is a Duffinian number.

856555 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 856555.

It is not an unprimeable number, because it can be changed into a prime (856553) 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 7 ways as a sum of consecutive naturals, for example, 12202 + ... + 12271.

It is an arithmetic number, because the mean of its divisors is an integer number (146844).

2⁸⁵⁶⁵⁵⁵ is an apocalyptic number.

856555 is a deficient number, since it is larger than the sum of its proper divisors (318197).

856555 is a wasteful number, since it uses less digits than its factorization.

856555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24485.

The product of its digits is 30000, while the sum is 34.

The square root of 856555 is about 925.5025661769. The cubic root of 856555 is about 94.9697040976.

It can be divided in two parts, 85655 and 5, that multiplied together give a triangular number (428275 = T₉₂₅).

The spelling of 856555 in words is "eight hundred fifty-six thousand, five hundred fifty-five".