123108520 has 32 divisors (see below), whose sum is σ = 279858600. Its totient is φ = 48734208.

The previous prime is 123108511. The next prime is 123108539. The reversal of 123108520 is 25801321.

It can be written as a sum of positive squares in 4 ways, for example, as 117809316 + 5299204 = 10854^2 + 2302^2 .

It is a junction number, because it is equal to n+sod(n) for n = 123108491 and 123108500.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11985 + ... + 19744.

Almost surely, 2^123108520 is an apocalyptic number.

123108520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123108520 is an abundant number, since it is smaller than the sum of its proper divisors (156750080).

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

123108520 is a wasteful number, since it uses less digits than its factorization.

123108520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31837 (or 31833 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 123108520 is about 11095.4278871975. The cubic root of 123108520 is about 497.4651979392.

Adding to 123108520 its reverse (25801321), we get a palindrome (148909841).

The spelling of 123108520 in words is "one hundred twenty-three million, one hundred eight thousand, five hundred twenty".