123618 has 16 divisors (see below), whose sum is σ = 269856. Its totient is φ = 37440.

The previous prime is 123601. The next prime is 123619. The reversal of 123618 is 816321.

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 = 123594 and 123603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 871 + ... + 1002.

It is an arithmetic number, because the mean of its divisors is an integer number (16866).

2¹²³⁶¹⁸ is an apocalyptic number.

123618 is an abundant number, since it is smaller than the sum of its proper divisors (146238).

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

123618 is a wasteful number, since it uses less digits than its factorization.

123618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1889.

The product of its digits is 288, while the sum is 21.

The square root of 123618 is about 351.5935152986. The cubic root of 123618 is about 49.8150500472.

Adding to 123618 its reverse (816321), we get a palindrome (939939).

It can be divided in two parts, 123 and 618, that added together give a triangular number (741 = T₃₈).

The spelling of 123618 in words is "one hundred twenty-three thousand, six hundred eighteen".