865530 has 48 divisors (see below), whose sum is σ = 2302560. Its totient is φ = 225504.

The previous prime is 865511. The next prime is 865537. The reversal of 865530 is 35568.

865530 is a `hidden beast` number, since 8 + 655 + 3 + 0 = 666.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 865494 and 865503.

It is not an unprimeable number, because it can be changed into a prime (865537) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5229 + ... + 5391.

It is an arithmetic number, because the mean of its divisors is an integer number (47970).

2⁸⁶⁵⁵³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 865530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1151280).

865530 is an abundant number, since it is smaller than the sum of its proper divisors (1437030).

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

865530 is a wasteful number, since it uses less digits than its factorization.

865530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 232 counting only the distinct ones).

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

The square root of 865530 is about 930.3386480202. The cubic root of 865530 is about 95.3002504189.

The spelling of 865530 in words is "eight hundred sixty-five thousand, five hundred thirty".