12911520 has 96 divisors (see below), whose sum is σ = 41827968. Its totient is φ = 3345408.

The previous prime is 12911519. The next prime is 12911527. The reversal of 12911520 is 2511921.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (12911527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17397 + ... + 18123.

It is an arithmetic number, because the mean of its divisors is an integer number (435708).

Almost surely, 2^12911520 is an apocalyptic number.

12911520 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 12911520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20913984).

12911520 is an abundant number, since it is smaller than the sum of its proper divisors (28916448).

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

12911520 is a wasteful number, since it uses less digits than its factorization.

12911520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782 (or 774 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 12911520 is about 3593.2603579479. The cubic root of 12911520 is about 234.5988024030.

It can be divided in two parts, 12911 and 520, that added together give a palindrome (13431).

The spelling of 12911520 in words is "twelve million, nine hundred eleven thousand, five hundred twenty".