43664429 has 2 divisors, whose sum is σ = 43664430. Its totient is φ = 43664428.

The previous prime is 43664417. The next prime is 43664441. The reversal of 43664429 is 92446634.

It is a balanced prime because it is at equal distance from previous prime (43664417) and next prime (43664441).

It can be written as a sum of positive squares in only one way, i.e., 41344900 + 2319529 = 6430^2 + 1523^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43664429 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 43664392 and 43664401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43664629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21832214 + 21832215.

It is an arithmetic number, because the mean of its divisors is an integer number (21832215).

Almost surely, 2^43664429 is an apocalyptic number.

It is an amenable number.

43664429 is a deficient number, since it is larger than the sum of its proper divisors (1).

43664429 is an equidigital number, since it uses as much as digits as its factorization.

43664429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 38.

The square root of 43664429 is about 6607.9065520027. The cubic root of 43664429 is about 352.1350554626.

The spelling of 43664429 in words is "forty-three million, six hundred sixty-four thousand, four hundred twenty-nine".