43628909 has 2 divisors, whose sum is σ = 43628910. Its totient is φ = 43628908.

The previous prime is 43628899. The next prime is 43628927. The reversal of 43628909 is 90982634.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40576900 + 3052009 = 6370^2 + 1747^2 .

It is a cyclic number.

It is not a de Polignac number, because 43628909 - 2⁸ = 43628653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43628939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21814454 + 21814455.

It is an arithmetic number, because the mean of its divisors is an integer number (21814455).

Almost surely, 2^43628909 is an apocalyptic number.

It is an amenable number.

43628909 is a deficient number, since it is larger than the sum of its proper divisors (1).

43628909 is an equidigital number, since it uses as much as digits as its factorization.

43628909 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 43628909 is about 6605.2183158469. The cubic root of 43628909 is about 352.0395449933.

The spelling of 43628909 in words is "forty-three million, six hundred twenty-eight thousand, nine hundred nine".