123856 has 10 divisors (see below), whose sum is σ = 240002. Its totient is φ = 61920.

The previous prime is 123853. The next prime is 123863. The reversal of 123856 is 658321.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 90000 + 33856 = 300^2 + 184^2 .

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 123856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3855 + ... + 3886.

2¹²³⁸⁵⁶ is an apocalyptic number.

123856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

123856 is a deficient number, since it is larger than the sum of its proper divisors (116146).

123856 is an equidigital number, since it uses as much as digits as its factorization.

123856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7749 (or 7743 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 123856 is about 351.9318115772. The cubic root of 123856 is about 49.8469989578.

It can be divided in two parts, 123 and 856, that added together give a palindrome (979).

The spelling of 123856 in words is "one hundred twenty-three thousand, eight hundred fifty-six".