12111520 has 48 divisors (see below), whose sum is σ = 29121120. Its totient is φ = 4758784.

The previous prime is 12111511. The next prime is 12111521. The reversal of 12111520 is 2511121.

It is a self number, because there is not a number n which added to its sum of digits gives 12111520.

It is not an unprimeable number, because it can be changed into a prime (12111521) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 8799 + ... + 10081.

It is an arithmetic number, because the mean of its divisors is an integer number (606690).

Almost surely, 2^12111520 is an apocalyptic number.

12111520 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 12111520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14560560).

12111520 is an abundant number, since it is smaller than the sum of its proper divisors (17009600).

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

12111520 is a wasteful number, since it uses less digits than its factorization.

12111520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357 (or 1349 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 12111520 is about 3480.1609158198. The cubic root of 12111520 is about 229.6498768647.

Adding to 12111520 its reverse (2511121), we get a palindrome (14622641).

The spelling of 12111520 in words is "twelve million, one hundred eleven thousand, five hundred twenty".