864918 has 40 divisors (see below), whose sum is σ = 2047320. Its totient is φ = 272160.

The previous prime is 864917. The next prime is 864947. The reversal of 864918 is 819468.

It is a happy number.

864918 is a `hidden beast` number, since 8 + 649 + 1 + 8 = 666.

864918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 864918.

It is not an unprimeable number, because it can be changed into a prime (864911) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2938 + ... + 3218.

It is an arithmetic number, because the mean of its divisors is an integer number (51183).

2⁸⁶⁴⁹¹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 864918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1023660).

864918 is an abundant number, since it is smaller than the sum of its proper divisors (1182402).

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

864918 is a wasteful number, since it uses less digits than its factorization.

864918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314 (or 305 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 864918 is about 930.0096773690. The cubic root of 864918 is about 95.2777834506.

The spelling of 864918 in words is "eight hundred sixty-four thousand, nine hundred eighteen".