43940891 has 4 divisors (see below), whose sum is σ = 44025432. Its totient is φ = 43856352.

The previous prime is 43940861. The next prime is 43940893. The reversal of 43940891 is 19804934.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 43940891 - 2²² = 39746587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43940893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41486 + ... + 42531.

It is an arithmetic number, because the mean of its divisors is an integer number (11006358).

Almost surely, 2^43940891 is an apocalyptic number.

43940891 is a deficient number, since it is larger than the sum of its proper divisors (84541).

43940891 is an equidigital number, since it uses as much as digits as its factorization.

43940891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84540.

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

The square root of 43940891 is about 6628.7925748208. The cubic root of 43940891 is about 352.8766752952.

The spelling of 43940891 in words is "forty-three million, nine hundred forty thousand, eight hundred ninety-one".