43818109 has 8 divisors (see below), whose sum is σ = 44484440. Its totient is φ = 43156800.

The previous prime is 43818091. The next prime is 43818133. The reversal of 43818109 is 90181834.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2576025 + 41242084 = 1605^2 + 6422^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 43818109 - 2⁷ = 43817981 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43818169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18619 + ... + 20839.

It is an arithmetic number, because the mean of its divisors is an integer number (5560555).

Almost surely, 2^43818109 is an apocalyptic number.

It is an amenable number.

43818109 is a deficient number, since it is larger than the sum of its proper divisors (666331).

43818109 is a wasteful number, since it uses less digits than its factorization.

43818109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2511.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 43818109 is about 6619.5248318894. The cubic root of 43818109 is about 352.5476930254.

The spelling of 43818109 in words is "forty-three million, eight hundred eighteen thousand, one hundred nine".