861223896 has 192 divisors, whose sum is σ = 2637573120. Its totient is φ = 252046080.

The previous prime is 861223841. The next prime is 861223919. The reversal of 861223896 is 698322168.

861223896 is a `hidden beast` number, since 8 + 612 + 23 + 8 + 9 + 6 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1943851 + ... + 1944293.

It is an arithmetic number, because the mean of its divisors is an integer number (13737360).

Almost surely, 2^861223896 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 861223896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1318786560).

861223896 is an abundant number, since it is smaller than the sum of its proper divisors (1776349224).

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

861223896 is a wasteful number, since it uses less digits than its factorization.

861223896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566 (or 559 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 861223896 is about 29346.6164318819. The cubic root of 861223896 is about 951.4194463087.

The spelling of 861223896 in words is "eight hundred sixty-one million, two hundred twenty-three thousand, eight hundred ninety-six".