43629809 has 2 divisors, whose sum is σ = 43629810. Its totient is φ = 43629808.

The previous prime is 43629749. The next prime is 43629811. The reversal of 43629809 is 90892634.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32171584 + 11458225 = 5672^2 + 3385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43629809 is a prime.

Together with 43629811, 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 (43629899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21814904 + 21814905.

It is an arithmetic number, because the mean of its divisors is an integer number (21814905).

Almost surely, 2^43629809 is an apocalyptic number.

It is an amenable number.

43629809 is a deficient number, since it is larger than the sum of its proper divisors (1).

43629809 is an equidigital number, since it uses as much as digits as its factorization.

43629809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 43629809 is about 6605.2864434482. The cubic root of 43629809 is about 352.0419656621.

The spelling of 43629809 in words is "forty-three million, six hundred twenty-nine thousand, eight hundred nine".