864140 has 12 divisors (see below), whose sum is σ = 1814736. Its totient is φ = 345648.

The previous prime is 864137. The next prime is 864151. The reversal of 864140 is 41468.

It is a happy number.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21584 + ... + 21623.

It is an arithmetic number, because the mean of its divisors is an integer number (151228).

2⁸⁶⁴¹⁴⁰ is an apocalyptic number.

It is an amenable number.

864140 is an abundant number, since it is smaller than the sum of its proper divisors (950596).

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

864140 is a wasteful number, since it uses less digits than its factorization.

864140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43216 (or 43214 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 864140 is about 929.5913080489. The cubic root of 864140 is about 95.2492071955.

The spelling of 864140 in words is "eight hundred sixty-four thousand, one hundred forty".