864040 has 16 divisors (see below), whose sum is σ = 1944180. Its totient is φ = 345600.

The previous prime is 864037. The next prime is 864047. The reversal of 864040 is 40468.

864040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 842724 + 21316 = 918^2 + 146^2 .

It is not an unprimeable number, because it can be changed into a prime (864047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10761 + ... + 10840.

2⁸⁶⁴⁰⁴⁰ is an apocalyptic number.

It is an amenable number.

864040 is an abundant number, since it is smaller than the sum of its proper divisors (1080140).

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

864040 is a wasteful number, since it uses less digits than its factorization.

864040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21612 (or 21608 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 864040 is about 929.5375194149. The cubic root of 864040 is about 95.2455329112.

The spelling of 864040 in words is "eight hundred sixty-four thousand, forty".