2105639244 has 72 divisors (see below), whose sum is σ = 5641822368. Its totient is φ = 659873280.

The previous prime is 2105639233. The next prime is 2105639273. The reversal of 2105639244 is 4429365012.

It is a happy number.

2105639244 is a `hidden beast` number, since 2 + 1 + 0 + 563 + 92 + 4 + 4 = 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 = 2105639199 and 2105639208.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 982414 + ... + 984554.

It is an arithmetic number, because the mean of its divisors is an integer number (78358644).

Almost surely, 2^2105639244 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 2105639244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2820911184).

2105639244 is an abundant number, since it is smaller than the sum of its proper divisors (3536183124).

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

2105639244 is a wasteful number, since it uses less digits than its factorization.

2105639244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3775 (or 3770 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 2105639244 is about 45887.2448944148. The cubic root of 2105639244 is about 1281.7244100518.

The spelling of 2105639244 in words is "two billion, one hundred five million, six hundred thirty-nine thousand, two hundred forty-four".