2044393681 has 16 divisors (see below), whose sum is σ = 2266195968. Its totient is φ = 1828818000.

The previous prime is 2044393669. The next prime is 2044393691. The reversal of 2044393681 is 1863934402.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2044393681 - 2⁵ = 2044393649 is a prime.

It is a super-2 number, since 2×2044393681² = 8359091045825459522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2044393651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171976 + ... + 183478.

It is an arithmetic number, because the mean of its divisors is an integer number (141637248).

Almost surely, 2^2044393681 is an apocalyptic number.

It is an amenable number.

2044393681 is a deficient number, since it is larger than the sum of its proper divisors (221802287).

2044393681 is a wasteful number, since it uses less digits than its factorization.

2044393681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11772.

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 2044393681 is about 45214.9718677343. The cubic root of 2044393681 is about 1269.1750032862.

The spelling of 2044393681 in words is "two billion, forty-four million, three hundred ninety-three thousand, six hundred eighty-one".