12005520 has 40 divisors (see below), whose sum is σ = 37217856. Its totient is φ = 3201408.

The previous prime is 12005509. The next prime is 12005527. The reversal of 12005520 is 2550021.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 12005520.

It is not an unprimeable number, because it can be changed into a prime (12005527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24772 + ... + 25251.

Almost surely, 2^12005520 is an apocalyptic number.

12005520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12005520 is an abundant number, since it is smaller than the sum of its proper divisors (25212336).

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

12005520 is a wasteful number, since it uses less digits than its factorization.

12005520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50039 (or 50033 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 12005520 is about 3464.8982669048. The cubic root of 12005520 is about 228.9779476994.

Adding to 12005520 its reverse (2550021), we get a palindrome (14555541).

The spelling of 12005520 in words is "twelve million, five thousand, five hundred twenty".