865521740 has 48 divisors (see below), whose sum is σ = 1928828160. Its totient is φ = 325533120.

The previous prime is 865521739. The next prime is 865521751. The reversal of 865521740 is 47125568.

It is a junction number, because it is equal to n+sod(n) for n = 865521694 and 865521703.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11195 + ... + 43085.

It is an arithmetic number, because the mean of its divisors is an integer number (40183920).

Almost surely, 2^865521740 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 865521740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (964414080).

865521740 is an abundant number, since it is smaller than the sum of its proper divisors (1063306420).

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

865521740 is a wasteful number, since it uses less digits than its factorization.

865521740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31982 (or 31980 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 865521740 is about 29419.7508487071. The cubic root of 865521740 is about 952.9994725881. Note that the first 3 decimals are identical.

The spelling of 865521740 in words is "eight hundred sixty-five million, five hundred twenty-one thousand, seven hundred forty".