4044437721 has 6 divisors (see below), whose sum is σ = 5841965610. Its totient is φ = 2696291808.

The previous prime is 4044437707. The next prime is 4044437767. The reversal of 4044437721 is 1277344404.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2657918025 + 1386519696 = 51555^2 + 37236^2 .

It is not a de Polignac number, because 4044437721 - 2⁵ = 4044437689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4044437021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 224690976 + ... + 224690993.

It is an arithmetic number, because the mean of its divisors is an integer number (973660935).

Almost surely, 2^4044437721 is an apocalyptic number.

It is an amenable number.

4044437721 is a deficient number, since it is larger than the sum of its proper divisors (1797527889).

4044437721 is a wasteful number, since it uses less digits than its factorization.

4044437721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449381975 (or 449381972 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 36.

The square root of 4044437721 is about 63595.8939004713. The cubic root of 4044437721 is about 1593.2577906282.

It can be divided in two parts, 404443 and 7721, that added together give a square (412164 = 642²).

The spelling of 4044437721 in words is "four billion, forty-four million, four hundred thirty-seven thousand, seven hundred twenty-one".