123885 has 12 divisors (see below), whose sum is σ = 214812. Its totient is φ = 66048.

The previous prime is 123863. The next prime is 123887. The reversal of 123885 is 588321.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 84681 + 39204 = 291^2 + 198^2 .

It is not a de Polignac number, because 123885 - 2⁵ = 123853 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123887) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1332 + ... + 1421.

It is an arithmetic number, because the mean of its divisors is an integer number (17901).

2¹²³⁸⁸⁵ is an apocalyptic number.

123885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123885 is a deficient number, since it is larger than the sum of its proper divisors (90927).

123885 is a wasteful number, since it uses less digits than its factorization.

123885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2764 (or 2761 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 123885 is about 351.9730103289. The cubic root of 123885 is about 49.8508890941.

The spelling of 123885 in words is "one hundred twenty-three thousand, eight hundred eighty-five".