12385520 has 80 divisors (see below), whose sum is σ = 34872768. Its totient is φ = 3993600.

The previous prime is 12385519. The next prime is 12385531. The reversal of 12385520 is 2558321.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×12385520² = 306802211340800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12385520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8870 + ... + 10170.

Almost surely, 2^12385520 is an apocalyptic number.

12385520 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 12385520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17436384).

12385520 is an abundant number, since it is smaller than the sum of its proper divisors (22487248).

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

12385520 is a wasteful number, since it uses less digits than its factorization.

12385520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338 (or 1332 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 12385520 is about 3519.3067499154. The cubic root of 12385520 is about 231.3687756039.

The spelling of 12385520 in words is "twelve million, three hundred eighty-five thousand, five hundred twenty".