123155560 has 64 divisors (see below), whose sum is σ = 312076800. Its totient is φ = 43334400.

The previous prime is 123155519. The next prime is 123155561. The reversal of 123155560 is 65551321.

It is not an unprimeable number, because it can be changed into a prime (123155561) 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, 9126 + ... + 18154.

It is an arithmetic number, because the mean of its divisors is an integer number (4876200).

Almost surely, 2^123155560 is an apocalyptic number.

123155560 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 123155560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156038400).

123155560 is an abundant number, since it is smaller than the sum of its proper divisors (188921240).

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

123155560 is a wasteful number, since it uses less digits than its factorization.

123155560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9082 (or 9078 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 123155560 is about 11097.5474768077. The cubic root of 123155560 is about 497.5285506708.

The spelling of 123155560 in words is "one hundred twenty-three million, one hundred fifty-five thousand, five hundred sixty".