43638943 has 4 divisors (see below), whose sum is σ = 44253648. Its totient is φ = 43024240.

The previous prime is 43638923. The next prime is 43638961. The reversal of 43638943 is 34983634.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 43638943 - 2²¹ = 41541791 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43638896 and 43638905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43638923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 307246 + ... + 307387.

It is an arithmetic number, because the mean of its divisors is an integer number (11063412).

Almost surely, 2^43638943 is an apocalyptic number.

43638943 is a deficient number, since it is larger than the sum of its proper divisors (614705).

43638943 is an equidigital number, since it uses as much as digits as its factorization.

43638943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614704.

The product of its digits is 186624, while the sum is 40.

The square root of 43638943 is about 6605.9778231538. The cubic root of 43638943 is about 352.0665308773.

The spelling of 43638943 in words is "forty-three million, six hundred thirty-eight thousand, nine hundred forty-three".