43986 has 8 divisors (see below), whose sum is σ = 87984. Its totient is φ = 14660.

The previous prime is 43973. The next prime is 43987. The reversal of 43986 is 68934.

It is a sphenic number, since it is the product of 3 distinct primes.

43986 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (43987) by changing a digit.

43986 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3660 + ... + 3671.

It is an arithmetic number, because the mean of its divisors is an integer number (10998).

2⁴³⁹⁸⁶ is an apocalyptic number.

43986 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43992).

43986 is a wasteful number, since it uses less digits than its factorization.

43986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7336.

The product of its digits is 5184, while the sum is 30.

The square root of 43986 is about 209.7283957885. The cubic root of 43986 is about 35.2997386472.

Subtracting from 43986 its sum of digits (30), we obtain a triangular number (43956 = T₂₉₆).

It can be divided in two parts, 439 and 86, that added together give a palindrome (525).

The spelling of 43986 in words is "forty-three thousand, nine hundred eighty-six".