865961244 has 72 divisors (see below), whose sum is σ = 2224312272. Its totient is φ = 284021760.

The previous prime is 865961203. The next prime is 865961251. The reversal of 865961244 is 442169568.

865961244 is a `hidden beast` number, since 8 + 6 + 596 + 12 + 44 = 666.

865961244 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×865961244² = 1499777752220055072, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 865961244.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1054354 + ... + 1055174.

It is an arithmetic number, because the mean of its divisors is an integer number (30893226).

Almost surely, 2^865961244 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 865961244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1112156136).

865961244 is an abundant number, since it is smaller than the sum of its proper divisors (1358351028).

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

865961244 is a wasteful number, since it uses less digits than its factorization.

865961244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1267 (or 1262 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 865961244 is about 29427.2194405112. The cubic root of 865961244 is about 953.1607534222.

The spelling of 865961244 in words is "eight hundred sixty-five million, nine hundred sixty-one thousand, two hundred forty-four".