864940 has 24 divisors (see below), whose sum is σ = 1849680. Its totient is φ = 339648.

The previous prime is 864917. The next prime is 864947. The reversal of 864940 is 49468.

864940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (864947) 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, 814 + ... + 1546.

It is an arithmetic number, because the mean of its divisors is an integer number (77070).

2⁸⁶⁴⁹⁴⁰ is an apocalyptic number.

It is an amenable number.

864940 is an abundant number, since it is smaller than the sum of its proper divisors (984740).

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

864940 is a wasteful number, since it uses less digits than its factorization.

864940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801 (or 799 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 864940 is about 930.0215051277. The cubic root of 864940 is about 95.2785912704.

The spelling of 864940 in words is "eight hundred sixty-four thousand, nine hundred forty".