43942809 has 4 divisors (see below), whose sum is σ = 58590416. Its totient is φ = 29295204.

The previous prime is 43942799. The next prime is 43942813. The reversal of 43942809 is 90824934.

43942809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 43942809 - 2¹¹ = 43940761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43942849) 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 3 ways as a sum of consecutive naturals, for example, 7323799 + ... + 7323804.

It is an arithmetic number, because the mean of its divisors is an integer number (14647604).

Almost surely, 2^43942809 is an apocalyptic number.

It is an amenable number.

43942809 is a deficient number, since it is larger than the sum of its proper divisors (14647607).

43942809 is a wasteful number, since it uses less digits than its factorization.

43942809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14647606.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 43942809 is about 6628.9372451397. The cubic root of 43942809 is about 352.8818095228.

The spelling of 43942809 in words is "forty-three million, nine hundred forty-two thousand, eight hundred nine".