12115520 has 28 divisors (see below), whose sum is σ = 28850844. Its totient is φ = 4846080.

The previous prime is 12115517. The next prime is 12115531. The reversal of 12115520 is 2551121.

It can be written as a sum of positive squares in 2 ways, for example, as 8904256 + 3211264 = 2984^2 + 1792^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18611 + ... + 19250.

Almost surely, 2^12115520 is an apocalyptic number.

12115520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12115520 is an abundant number, since it is smaller than the sum of its proper divisors (16735324).

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

12115520 is an equidigital number, since it uses as much as digits as its factorization.

12115520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37878 (or 37868 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 12115520 is about 3480.7355544482. The cubic root of 12115520 is about 229.6751557837.

Subtracting from 12115520 its sum of digits (17), we obtain a triangular number (12115503 = T₄₉₂₂).

Adding to 12115520 its reverse (2551121), we get a palindrome (14666641).

The spelling of 12115520 in words is "twelve million, one hundred fifteen thousand, five hundred twenty".