43385809 has 4 divisors (see below), whose sum is σ = 43873380. Its totient is φ = 42898240.

The previous prime is 43385807. The next prime is 43385813. The reversal of 43385809 is 90858334.

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

It can be written as a sum of positive squares in 2 ways, for example, as 25280784 + 18105025 = 5028^2 + 4255^2 .

It is a cyclic number.

It is not a de Polignac number, because 43385809 - 2¹ = 43385807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43385801) 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, 243652 + ... + 243829.

It is an arithmetic number, because the mean of its divisors is an integer number (10968345).

Almost surely, 2^43385809 is an apocalyptic number.

It is an amenable number.

43385809 is a deficient number, since it is larger than the sum of its proper divisors (487571).

43385809 is an equidigital number, since it uses as much as digits as its factorization.

43385809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487570.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 43385809 is about 6586.7904931006. The cubic root of 43385809 is about 351.3844727706.

The spelling of 43385809 in words is "forty-three million, three hundred eighty-five thousand, eight hundred nine".