43398809 has 2 divisors, whose sum is σ = 43398810. Its totient is φ = 43398808.

The previous prime is 43398799. The next prime is 43398827. The reversal of 43398809 is 90889334.

43398809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36638809 + 6760000 = 6053^2 + 2600^2 .

It is a cyclic number.

It is not a de Polignac number, because 43398809 - 2¹² = 43394713 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43398809.

It is not a weakly prime, because it can be changed into another prime (43398409) 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 as a sum of consecutive naturals, namely, 21699404 + 21699405.

It is an arithmetic number, because the mean of its divisors is an integer number (21699405).

Almost surely, 2^43398809 is an apocalyptic number.

It is an amenable number.

43398809 is a deficient number, since it is larger than the sum of its proper divisors (1).

43398809 is an equidigital number, since it uses as much as digits as its factorization.

43398809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 43398809 is about 6587.7772427428. Note that the first 3 decimals coincide. The cubic root of 43398809 is about 351.4195652127.

The spelling of 43398809 in words is "forty-three million, three hundred ninety-eight thousand, eight hundred nine".