865140 has 24 divisors (see below), whose sum is σ = 2422560. Its totient is φ = 230688.

The previous prime is 865121. The next prime is 865153. The reversal of 865140 is 41568.

865140 = T₃₀₁ + T₃₀₂ + ... + T₃₁₈.

It is a self number, because there is not a number n which added to its sum of digits gives 865140.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 865140.

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 7 ways as a sum of consecutive naturals, for example, 7150 + ... + 7269.

It is an arithmetic number, because the mean of its divisors is an integer number (100940).

2⁸⁶⁵¹⁴⁰ is an apocalyptic number.

It is an amenable number.

865140 is an abundant number, since it is smaller than the sum of its proper divisors (1557420).

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

865140 is a wasteful number, since it uses less digits than its factorization.

865140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14431 (or 14429 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 865140 is about 930.1290233081. The cubic root of 865140 is about 95.2859344578.

The spelling of 865140 in words is "eight hundred sixty-five thousand, one hundred forty".