865263 has 8 divisors (see below), whose sum is σ = 1318528. Its totient is φ = 494424.

The previous prime is 865261. The next prime is 865301. The reversal of 865263 is 362568.

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

It is not a de Polignac number, because 865263 - 2¹ = 865261 is a prime.

It is a Duffinian number.

865263 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 865263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865261) 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, 20581 + ... + 20622.

It is an arithmetic number, because the mean of its divisors is an integer number (164816).

2⁸⁶⁵²⁶³ is an apocalyptic number.

865263 is a deficient number, since it is larger than the sum of its proper divisors (453265).

865263 is a wasteful number, since it uses less digits than its factorization.

865263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41213.

The product of its digits is 8640, while the sum is 30.

The square root of 865263 is about 930.1951408172. The cubic root of 865263 is about 95.2904499561.

It can be divided in two parts, 865 and 263, that added together give a triangular number (1128 = T₄₇).

The spelling of 865263 in words is "eight hundred sixty-five thousand, two hundred sixty-three".