123855 has 16 divisors (see below), whose sum is σ = 207360. Its totient is φ = 63008.

The previous prime is 123853. The next prime is 123863. The reversal of 123855 is 558321.

It is a cyclic number.

It is not a de Polignac number, because 123855 - 2¹ = 123853 is a prime.

It is a super-2 number, since 2×123855² = 30680122050, which contains 22 as substring.

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 (123853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166 + ... + 524.

It is an arithmetic number, because the mean of its divisors is an integer number (12960).

2¹²³⁸⁵⁵ is an apocalyptic number.

123855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123855 is a deficient number, since it is larger than the sum of its proper divisors (83505).

123855 is a wasteful number, since it uses less digits than its factorization.

123855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390.

The product of its digits is 1200, while the sum is 24.

The square root of 123855 is about 351.9303908446. The cubic root of 123855 is about 49.8468648044.

The spelling of 123855 in words is "one hundred twenty-three thousand, eight hundred fifty-five".