43909841 has 4 divisors (see below), whose sum is σ = 44403300. Its totient is φ = 43416384.

The previous prime is 43909823. The next prime is 43909843. The reversal of 43909841 is 14890934.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14890934 = 2 ⋅7445467.

It can be written as a sum of positive squares in 2 ways, for example, as 5779216 + 38130625 = 2404^2 + 6175^2 .

It is a cyclic number.

It is not a de Polignac number, because 43909841 - 2¹⁴ = 43893457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43909795 and 43909804.

It is not an unprimeable number, because it can be changed into a prime (43909843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246596 + ... + 246773.

It is an arithmetic number, because the mean of its divisors is an integer number (11100825).

Almost surely, 2^43909841 is an apocalyptic number.

It is an amenable number.

43909841 is a deficient number, since it is larger than the sum of its proper divisors (493459).

43909841 is an equidigital number, since it uses as much as digits as its factorization.

43909841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493458.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 43909841 is about 6626.4501054486. The cubic root of 43909841 is about 352.7935378322.

The spelling of 43909841 in words is "forty-three million, nine hundred nine thousand, eight hundred forty-one".