43971643 has 4 divisors (see below), whose sum is σ = 46285960. Its totient is φ = 41657328.

The previous prime is 43971619. The next prime is 43971679. The reversal of 43971643 is 34617934.

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 43971643 - 2⁹ = 43971131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43971143) 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, 1157130 + ... + 1157167.

It is an arithmetic number, because the mean of its divisors is an integer number (11571490).

Almost surely, 2^43971643 is an apocalyptic number.

43971643 is a deficient number, since it is larger than the sum of its proper divisors (2314317).

43971643 is a wasteful number, since it uses less digits than its factorization.

43971643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2314316.

The product of its digits is 54432, while the sum is 37.

The square root of 43971643 is about 6631.1117469094. Note that the first 3 decimals coincide. The cubic root of 43971643 is about 352.9589762586.

The spelling of 43971643 in words is "forty-three million, nine hundred seventy-one thousand, six hundred forty-three".