123606 has 40 divisors (see below), whose sum is σ = 319440. Its totient is φ = 34992.

The previous prime is 123601. The next prime is 123619. The reversal of 123606 is 606321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123601) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1080 + ... + 1188.

It is an arithmetic number, because the mean of its divisors is an integer number (7986).

2¹²³⁶⁰⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159720).

123606 is an abundant number, since it is smaller than the sum of its proper divisors (195834).

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

123606 is a wasteful number, since it uses less digits than its factorization.

123606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 123606 is about 351.5764497232. The cubic root of 123606 is about 49.8134380922.

Adding to 123606 its reverse (606321), we get a palindrome (729927).

It can be divided in two parts, 123 and 606, that added together give a 6-th power (729 = 3⁶).

The spelling of 123606 in words is "one hundred twenty-three thousand, six hundred six".