43664423 has 6 divisors (see below), whose sum is σ = 47994912. Its totient is φ = 39694820.

The previous prime is 43664417. The next prime is 43664429. The reversal of 43664423 is 32446634.

It is an interprime number because it is at equal distance from previous prime (43664417) and next prime (43664429).

It is not a de Polignac number, because 43664423 - 2⁴ = 43664407 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 43664423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43664429) 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 5 ways as a sum of consecutive naturals, for example, 180311 + ... + 180552.

It is an arithmetic number, because the mean of its divisors is an integer number (7999152).

Almost surely, 2^43664423 is an apocalyptic number.

43664423 is a deficient number, since it is larger than the sum of its proper divisors (4330489).

43664423 is a wasteful number, since it uses less digits than its factorization.

43664423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360885 (or 360874 counting only the distinct ones).

The product of its digits is 41472, while the sum is 32.

The square root of 43664423 is about 6607.9060980011. The cubic root of 43664423 is about 352.1350393335.

It can be divided in two parts, 43 and 664423, that added together give a palindrome (664466).

The spelling of 43664423 in words is "forty-three million, six hundred sixty-four thousand, four hundred twenty-three".