43640063 has 2 divisors, whose sum is σ = 43640064. Its totient is φ = 43640062.

The previous prime is 43640053. The next prime is 43640081. The reversal of 43640063 is 36004634.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43640063 - 2⁸ = 43639807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43640053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21820031 + 21820032.

It is an arithmetic number, because the mean of its divisors is an integer number (21820032).

Almost surely, 2^43640063 is an apocalyptic number.

43640063 is a deficient number, since it is larger than the sum of its proper divisors (1).

43640063 is an equidigital number, since it uses as much as digits as its factorization.

43640063 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 26.

The square root of 43640063 is about 6606.0625943144. The cubic root of 43640063 is about 352.0695427983.

Adding to 43640063 its reverse (36004634), we get a palindrome (79644697).

The spelling of 43640063 in words is "forty-three million, six hundred forty thousand, sixty-three".