43389909 has 6 divisors (see below), whose sum is σ = 62674326. Its totient is φ = 28926600.

The previous prime is 43389889. The next prime is 43389911. The reversal of 43389909 is 90998334.

43389909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 31979025 + 11410884 = 5655^2 + 3378^2 .

It is not a de Polignac number, because 43389909 - 2⁵ = 43389877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43389919) 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 5 ways as a sum of consecutive naturals, for example, 2410542 + ... + 2410559.

It is an arithmetic number, because the mean of its divisors is an integer number (10445721).

Almost surely, 2^43389909 is an apocalyptic number.

It is an amenable number.

43389909 is a deficient number, since it is larger than the sum of its proper divisors (19284417).

43389909 is a wasteful number, since it uses less digits than its factorization.

43389909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4821107 (or 4821104 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 43389909 is about 6587.1017147149. The cubic root of 43389909 is about 351.3955411437.

The spelling of 43389909 in words is "forty-three million, three hundred eighty-nine thousand, nine hundred nine".