123859 has 4 divisors (see below), whose sum is σ = 128160. Its totient is φ = 119560.

The previous prime is 123853. The next prime is 123863. The reversal of 123859 is 958321.

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

It is a cyclic number.

It is not a de Polignac number, because 123859 - 2⁷ = 123731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123853) 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 in 3 ways as a sum of consecutive naturals, for example, 2107 + ... + 2164.

It is an arithmetic number, because the mean of its divisors is an integer number (32040).

2¹²³⁸⁵⁹ is an apocalyptic number.

123859 is a deficient number, since it is larger than the sum of its proper divisors (4301).

123859 is an equidigital number, since it uses as much as digits as its factorization.

123859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4300.

The product of its digits is 2160, while the sum is 28.

The square root of 123859 is about 351.9360737407. The cubic root of 123859 is about 49.8474014139.

The spelling of 123859 in words is "one hundred twenty-three thousand, eight hundred fifty-nine".