123018 has 32 divisors (see below), whose sum is σ = 293760. Its totient is φ = 33600.

The previous prime is 123017. The next prime is 123031. The reversal of 123018 is 810321.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 122988 and 123006.

It is not an unprimeable number, because it can be changed into a prime (123017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1168 + ... + 1268.

It is an arithmetic number, because the mean of its divisors is an integer number (9180).

2¹²³⁰¹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146880).

123018 is an abundant number, since it is smaller than the sum of its proper divisors (170742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123018 is a wasteful number, since it uses less digits than its factorization.

123018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 123018 is about 350.7392193639. The cubic root of 123018 is about 49.7343241606.

Adding to 123018 its reverse (810321), we get a palindrome (933339).

The spelling of 123018 in words is "one hundred twenty-three thousand, eighteen".