865242 has 60 divisors (see below), whose sum is σ = 2276010. Its totient is φ = 244944.

The previous prime is 865231. The next prime is 865247. The reversal of 865242 is 242568.

865242 is a `hidden beast` number, since 8 + 652 + 4 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 670761 + 194481 = 819^2 + 441^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (865247) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 7884 + ... + 7992.

2⁸⁶⁵²⁴² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 865242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1138005).

865242 is an abundant number, since it is smaller than the sum of its proper divisors (1410768).

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

865242 is a wasteful number, since it uses less digits than its factorization.

865242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 121 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 865242 is about 930.1838527947. The cubic root of 865242 is about 95.2896790477.

The spelling of 865242 in words is "eight hundred sixty-five thousand, two hundred forty-two".