865318140 has 144 divisors (see below), whose sum is σ = 2865582720. Its totient is φ = 218583360.

The previous prime is 865318133. The next prime is 865318169. The reversal of 865318140 is 41813568.

865318140 is a `hidden beast` number, since 8 + 6 + 531 + 81 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 865318095 and 865318104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 87655 + ... + 97025.

It is an arithmetic number, because the mean of its divisors is an integer number (19899880).

Almost surely, 2^865318140 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 865318140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1432791360).

865318140 is an abundant number, since it is smaller than the sum of its proper divisors (2000264580).

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

865318140 is a wasteful number, since it uses less digits than its factorization.

865318140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9414 (or 9400 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 865318140 is about 29416.2903847511. The cubic root of 865318140 is about 952.9247408204.

The spelling of 865318140 in words is "eight hundred sixty-five million, three hundred eighteen thousand, one hundred forty".