43648019 has 2 divisors, whose sum is σ = 43648020. Its totient is φ = 43648018.

The previous prime is 43648009. The next prime is 43648051. The reversal of 43648019 is 91084634.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43648019 - 2⁸ = 43647763 is a prime.

It is a super-2 number, since 2×43648019² = 3810299125248722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43648019.

It is not a weakly prime, because it can be changed into another prime (43648009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21824009 + 21824010.

It is an arithmetic number, because the mean of its divisors is an integer number (21824010).

Almost surely, 2^43648019 is an apocalyptic number.

43648019 is a deficient number, since it is larger than the sum of its proper divisors (1).

43648019 is an equidigital number, since it uses as much as digits as its factorization.

43648019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 43648019 is about 6606.6647410021. The cubic root of 43648019 is about 352.0909367109.

The spelling of 43648019 in words is "forty-three million, six hundred forty-eight thousand, nineteen".