43995721 has 24 divisors (see below), whose sum is σ = 55838720. Its totient is φ = 33929280.

The previous prime is 43995719. The next prime is 43995733. The reversal of 43995721 is 12759934.

43995721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 43995721 - 2¹ = 43995719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43995781) by changing a digit.

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, 107365 + ... + 107773.

Almost surely, 2^43995721 is an apocalyptic number.

It is an amenable number.

43995721 is a deficient number, since it is larger than the sum of its proper divisors (11842999).

43995721 is a wasteful number, since it uses less digits than its factorization.

43995721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565 (or 554 counting only the distinct ones).

The product of its digits is 68040, while the sum is 40.

The square root of 43995721 is about 6632.9270311078. The cubic root of 43995721 is about 353.0233889491.

The spelling of 43995721 in words is "forty-three million, nine hundred ninety-five thousand, seven hundred twenty-one".