43664973 has 16 divisors (see below), whose sum is σ = 63823872. Its totient is φ = 26334000.

The previous prime is 43664947. The next prime is 43664977. The reversal of 43664973 is 37946634.

It is not a de Polignac number, because 43664973 - 2¹⁸ = 43402829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43664977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3828 + ... + 10098.

It is an arithmetic number, because the mean of its divisors is an integer number (3988992).

Almost surely, 2^43664973 is an apocalyptic number.

It is an amenable number.

43664973 is a deficient number, since it is larger than the sum of its proper divisors (20158899).

43664973 is a wasteful number, since it uses less digits than its factorization.

43664973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6496.

The product of its digits is 326592, while the sum is 42.

The square root of 43664973 is about 6607.9477146842. The cubic root of 43664973 is about 352.1365178328.

It can be divided in two parts, 4366 and 4973, that added together give a palindrome (9339).

The spelling of 43664973 in words is "forty-three million, six hundred sixty-four thousand, nine hundred seventy-three".