865063 has 4 divisors (see below), whose sum is σ = 867640. Its totient is φ = 862488.

The previous prime is 865061. The next prime is 865069. The reversal of 865063 is 360568.

It is a semiprime because it is the product of two primes.

It is a 3-Lehmer number, since φ(865063) divides (865063-1)³.

It is a cyclic number.

It is not a de Polignac number, because 865063 - 2¹ = 865061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865061) 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 3 ways as a sum of consecutive naturals, for example, 693 + ... + 1486.

It is an arithmetic number, because the mean of its divisors is an integer number (216910).

2⁸⁶⁵⁰⁶³ is an apocalyptic number.

865063 is a deficient number, since it is larger than the sum of its proper divisors (2577).

865063 is a wasteful number, since it uses less digits than its factorization.

865063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2576.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 865063 is about 930.0876302801. The cubic root of 865063 is about 95.2831074647.

The spelling of 865063 in words is "eight hundred sixty-five thousand, sixty-three".