43963 has 2 divisors, whose sum is σ = 43964. Its totient is φ = 43962.

The previous prime is 43961. The next prime is 43969. The reversal of 43963 is 36934.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43963 - 2¹ = 43961 is a prime.

Together with 43961, it forms a pair of twin primes.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (43961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21981 + 21982.

It is an arithmetic number, because the mean of its divisors is an integer number (21982).

2⁴³⁹⁶³ is an apocalyptic number.

43963 is a deficient number, since it is larger than the sum of its proper divisors (1).

43963 is an equidigital number, since it uses as much as digits as its factorization.

43963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 25.

The square root of 43963 is about 209.6735557957. The cubic root of 43963 is about 35.2935849048.

The spelling of 43963 in words is "forty-three thousand, nine hundred sixty-three".