43669 has 2 divisors, whose sum is σ = 43670.
Its totient is φ = 43668.
The previous prime is 43661. The next prime is 43691. The reversal of 43669 is 96634.
It can be divided in two parts, 436 and 69, that added together give a palindrome (505).
43669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 36100 + 7569 = 190^2 + 87^2
It is a cyclic number.
It is not a de Polignac number, because 43669 - 23 = 43661 is a prime.
It is a super-3 number, since 3×436693 = 249827933361927, which contains 333 as substring. Note that it is a super-d number also for d = 2.
It is a Chen prime.
43669 is a lucky number.
It is a nialpdrome in base 4 and base 16.
It is a zygodrome in base 4.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (43661) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21834 + 21835.
It is an arithmetic number, because the mean of its divisors is an integer number (21835).
243669 is an apocalyptic number.
It is an amenable number.
43669 is a deficient number, since it is larger than the sum of its proper divisors (1).
43669 is an equidigital number, since it uses as much as digits as its factorization.
43669 is an evil number, because the sum of its binary digits is even.
The product of its digits is 3888, while the sum is 28.
The square root of 43669 is about 208.9712898941.
The cubic root of 43669 is about 35.2147342758.
The spelling of 43669 in words is "forty-three thousand, six hundred sixty-nine".