856530 has 48 divisors (see below), whose sum is σ = 2306304. Its totient is φ = 220320.

The previous prime is 856529. The next prime is 856547. The reversal of 856530 is 35658.

856530 is a `hidden beast` number, since 8 + 5 + 653 + 0 = 666.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 856494 and 856503.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 856530.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2637 + ... + 2943.

It is an arithmetic number, because the mean of its divisors is an integer number (48048).

2⁸⁵⁶⁵³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1153152).

856530 is an abundant number, since it is smaller than the sum of its proper divisors (1449774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

856530 is a wasteful number, since it uses less digits than its factorization.

856530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351 (or 348 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 856530 is about 925.4890599029. The cubic root of 856530 is about 94.9687801384.

The spelling of 856530 in words is "eight hundred fifty-six thousand, five hundred thirty".