43663 has 4 divisors (see below), whose sum is σ = 44640. Its totient is φ = 42688.

The previous prime is 43661. The next prime is 43669. The reversal of 43663 is 36634.

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 43663 - 2¹ = 43661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43661) 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, 418 + ... + 511.

It is an arithmetic number, because the mean of its divisors is an integer number (11160).

2⁴³⁶⁶³ is an apocalyptic number.

43663 is a deficient number, since it is larger than the sum of its proper divisors (977).

43663 is an equidigital number, since it uses as much as digits as its factorization.

43663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976.

The product of its digits is 1296, while the sum is 22.

The square root of 43663 is about 208.9569333619. The cubic root of 43663 is about 35.2131213995.

The spelling of 43663 in words is "forty-three thousand, six hundred sixty-three".