43328009 has 2 divisors, whose sum is σ = 43328010. Its totient is φ = 43328008.

The previous prime is 43327997. The next prime is 43328011. The reversal of 43328009 is 90082334.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25452025 + 17875984 = 5045^2 + 4228^2 .

It is a cyclic number.

It is not a de Polignac number, because 43328009 - 2¹² = 43323913 is a prime.

Together with 43328011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43328609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21664004 + 21664005.

It is an arithmetic number, because the mean of its divisors is an integer number (21664005).

Almost surely, 2^43328009 is an apocalyptic number.

It is an amenable number.

43328009 is a deficient number, since it is larger than the sum of its proper divisors (1).

43328009 is an equidigital number, since it uses as much as digits as its factorization.

43328009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 43328009 is about 6582.4014614729. The cubic root of 43328009 is about 351.2283614452.

The spelling of 43328009 in words is "forty-three million, three hundred twenty-eight thousand, nine".