123520 has 32 divisors (see below), whose sum is σ = 296820. Its totient is φ = 49152.

The previous prime is 123517. The next prime is 123527. The reversal of 123520 is 25321.

It can be written as a sum of positive squares in 2 ways, for example, as 118336 + 5184 = 344^2 + 72^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 123520.

It is not an unprimeable number, because it can be changed into a prime (123527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 544 + ... + 736.

2¹²³⁵²⁰ is an apocalyptic number.

123520 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 123520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148410).

123520 is an abundant number, since it is smaller than the sum of its proper divisors (173300).

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

123520 is an equidigital number, since it uses as much as digits as its factorization.

123520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 123520 is about 351.4541221838. The cubic root of 123520 is about 49.8018826942.

Adding to 123520 its reverse (25321), we get a palindrome (148841).

The spelling of 123520 in words is "one hundred twenty-three thousand, five hundred twenty".