123663 has 4 divisors (see below), whose sum is σ = 164888. Its totient is φ = 82440.

The previous prime is 123661. The next prime is 123667. The reversal of 123663 is 366321.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 123663 - 2¹ = 123661 is a prime.

It is a D-number.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123661) 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, 20608 + ... + 20613.

It is an arithmetic number, because the mean of its divisors is an integer number (41222).

2¹²³⁶⁶³ is an apocalyptic number.

123663 is a deficient number, since it is larger than the sum of its proper divisors (41225).

123663 is an equidigital number, since it uses as much as digits as its factorization.

123663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41224.

The product of its digits is 648, while the sum is 21.

The square root of 123663 is about 351.6575038301. The cubic root of 123663 is about 49.8210939493.

Adding to 123663 its reverse (366321), we get a palindrome (489984).

It can be divided in two parts, 12 and 3663, that multiplied together give a triangular number (43956 = T₂₉₆).

The spelling of 123663 in words is "one hundred twenty-three thousand, six hundred sixty-three".