43664963 has 4 divisors (see below), whose sum is σ = 43698408. Its totient is φ = 43631520.

The previous prime is 43664947. The next prime is 43664977. The reversal of 43664963 is 36946634.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36946634 = 2 ⋅18473317.

It is a cyclic number.

It is not a de Polignac number, because 43664963 - 2⁴ = 43664947 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43664963.

It is not an unprimeable number, because it can be changed into a prime (43664903) 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 in 3 ways as a sum of consecutive naturals, for example, 14681 + ... + 17402.

It is an arithmetic number, because the mean of its divisors is an integer number (10924602).

Almost surely, 2^43664963 is an apocalyptic number.

43664963 is a deficient number, since it is larger than the sum of its proper divisors (33445).

43664963 is a wasteful number, since it uses less digits than its factorization.

43664963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33444.

The product of its digits is 279936, while the sum is 41.

The square root of 43664963 is about 6607.9469580196. The cubic root of 43664963 is about 352.1364909511.

The spelling of 43664963 in words is "forty-three million, six hundred sixty-four thousand, nine hundred sixty-three".