43643 has 4 divisors (see below), whose sum is σ = 45960. Its totient is φ = 41328.

The previous prime is 43633. The next prime is 43649. The reversal of 43643 is 34634.

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: 34634 = 2 ⋅17317.

It is a cyclic number.

It is not a de Polignac number, because 43643 - 2⁴ = 43627 is a prime.

It is a super-2 number, since 2×43643² = 3809422898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43649) 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, 1130 + ... + 1167.

It is an arithmetic number, because the mean of its divisors is an integer number (11490).

2⁴³⁶⁴³ is an apocalyptic number.

43643 is a deficient number, since it is larger than the sum of its proper divisors (2317).

43643 is a wasteful number, since it uses less digits than its factorization.

43643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2316.

The product of its digits is 864, while the sum is 20.

The square root of 43643 is about 208.9090711290. The cubic root of 43643 is about 35.2077440778.

Subtracting from 43643 its reverse (34634), we obtain a palindrome (9009).

It can be divided in two parts, 43 and 643, that added together give a palindrome (686).

The spelling of 43643 in words is "forty-three thousand, six hundred forty-three".