43640339 has 2 divisors, whose sum is σ = 43640340. Its totient is φ = 43640338.

The previous prime is 43640329. The next prime is 43640341. The reversal of 43640339 is 93304634.

It is a happy number.

43640339 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43640339 - 2⁴ = 43640323 is a prime.

It is a Sophie Germain prime.

Together with 43640341, 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 (43640329) 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, 21820169 + 21820170.

It is an arithmetic number, because the mean of its divisors is an integer number (21820170).

Almost surely, 2^43640339 is an apocalyptic number.

43640339 is a deficient number, since it is larger than the sum of its proper divisors (1).

43640339 is an equidigital number, since it uses as much as digits as its factorization.

43640339 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 32.

The square root of 43640339 is about 6606.0834841833. The cubic root of 43640339 is about 352.0702850137.

The spelling of 43640339 in words is "forty-three million, six hundred forty thousand, three hundred thirty-nine".