43686643 has 32 divisors (see below), whose sum is σ = 61770240. Its totient is φ = 29756160.

The previous prime is 43686623. The next prime is 43686647. The reversal of 43686643 is 34668634.

It is not a de Polignac number, because 43686643 - 2⁵ = 43686611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 43686596 and 43686605.

It is not an unprimeable number, because it can be changed into a prime (43686647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17871 + ... + 20167.

It is an arithmetic number, because the mean of its divisors is an integer number (1930320).

Almost surely, 2^43686643 is an apocalyptic number.

43686643 is a deficient number, since it is larger than the sum of its proper divisors (18083597).

43686643 is a wasteful number, since it uses less digits than its factorization.

43686643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2347.

The product of its digits is 248832, while the sum is 40.

The square root of 43686643 is about 6609.5872034492. The cubic root of 43686643 is about 352.1947608273.

Subtracting from 43686643 its reverse (34668634), we obtain a square (9018009 = 3003²).

It can be divided in two parts, 4368 and 6643, that added together give a palindrome (11011).

The spelling of 43686643 in words is "forty-three million, six hundred eighty-six thousand, six hundred forty-three".