123523220 has 48 divisors (see below), whose sum is σ = 269595648. Its totient is φ = 47489280.

The previous prime is 123523187. The next prime is 123523229. The reversal of 123523220 is 22325321.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 123523192 and 123523201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123523229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102944 + ... + 104136.

It is an arithmetic number, because the mean of its divisors is an integer number (5616576).

Almost surely, 2^123523220 is an apocalyptic number.

123523220 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 123523220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134797824).

123523220 is an abundant number, since it is smaller than the sum of its proper divisors (146072428).

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

123523220 is a wasteful number, since it uses less digits than its factorization.

123523220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400 (or 1398 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 123523220 is about 11114.1000535356. The cubic root of 123523220 is about 498.0231544639.

Adding to 123523220 its reverse (22325321), we get a palindrome (145848541).

The spelling of 123523220 in words is "one hundred twenty-three million, five hundred twenty-three thousand, two hundred twenty".