864912 has 40 divisors (see below), whose sum is σ = 2299456. Its totient is φ = 279936.

The previous prime is 864911. The next prime is 864917. The reversal of 864912 is 219468.

It is a self number, because there is not a number n which added to its sum of digits gives 864912.

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 7 ways as a sum of consecutive naturals, for example, 1533 + ... + 2019.

2⁸⁶⁴⁹¹² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 864912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1149728).

864912 is an abundant number, since it is smaller than the sum of its proper divisors (1434544).

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

864912 is a wasteful number, since it uses less digits than its factorization.

864912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535 (or 529 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 864912 is about 930.0064515905. The cubic root of 864912 is about 95.2775631338.

The spelling of 864912 in words is "eight hundred sixty-four thousand, nine hundred twelve".