123660 has 48 divisors (see below), whose sum is σ = 386400. Its totient is φ = 32832.

The previous prime is 123653. The next prime is 123661. The reversal of 123660 is 66321.

It is a happy number.

123660 is a `hidden beast` number, since 1 + 2 + 3 + 660 = 666.

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

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 (123661) 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, 426 + ... + 654.

It is an arithmetic number, because the mean of its divisors is an integer number (8050).

2¹²³⁶⁶⁰ is an apocalyptic number.

123660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193200).

123660 is an abundant number, since it is smaller than the sum of its proper divisors (262740).

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

123660 is a wasteful number, since it uses less digits than its factorization.

123660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247 (or 239 counting only the distinct ones).

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

The square root of 123660 is about 351.6532382902. The cubic root of 123660 is about 49.8206910682.

Adding to 123660 its reverse (66321), we get a palindrome (189981).

It can be divided in two parts, 1236 and 60, that added together give a 4-th power (1296 = 6⁴).

The spelling of 123660 in words is "one hundred twenty-three thousand, six hundred sixty".