868240 has 20 divisors (see below), whose sum is σ = 2018844. Its totient is φ = 347264.

The previous prime is 868229. The next prime is 868249. The reversal of 868240 is 42868.

It can be written as a sum of positive squares in 2 ways, for example, as 389376 + 478864 = 624^2 + 692^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 868199 and 868208.

It is not an unprimeable number, because it can be changed into a prime (868249) 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, 5347 + ... + 5506.

2⁸⁶⁸²⁴⁰ is an apocalyptic number.

868240 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

868240 is an abundant number, since it is smaller than the sum of its proper divisors (1150604).

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

868240 is a wasteful number, since it uses less digits than its factorization.

868240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10866 (or 10860 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 868240 is about 931.7939686433. The cubic root of 868240 is about 95.3996094255.

The spelling of 868240 in words is "eight hundred sixty-eight thousand, two hundred forty".