864540 has 48 divisors (see below), whose sum is σ = 2691360. Its totient is φ = 230400.

The previous prime is 864533. The next prime is 864541. The reversal of 864540 is 45468.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864541) by changing a digit.

864540 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261 + ... + 1340.

It is an arithmetic number, because the mean of its divisors is an integer number (56070).

2⁸⁶⁴⁵⁴⁰ 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 864540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1345680).

864540 is an abundant number, since it is smaller than the sum of its proper divisors (1826820).

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

864540 is a wasteful number, since it uses less digits than its factorization.

864540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1619 (or 1611 counting only the distinct ones).

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

The square root of 864540 is about 929.8064314684. The cubic root of 864540 is about 95.2639014988.

The spelling of 864540 in words is "eight hundred sixty-four thousand, five hundred forty".