12555520 has 72 divisors (see below), whose sum is σ = 31898664. Its totient is φ = 4718592.

The previous prime is 12555511. The next prime is 12555547. The reversal of 12555520 is 2555521.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6718464 + 5837056 = 2592^2 + 2416^2 .

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 21472 + ... + 22048.

It is an arithmetic number, because the mean of its divisors is an integer number (443037).

Almost surely, 2^12555520 is an apocalyptic number.

12555520 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 12555520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15949332).

12555520 is an abundant number, since it is smaller than the sum of its proper divisors (19343144).

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

12555520 is an equidigital number, since it uses as much as digits as its factorization.

12555520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615 (or 601 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 12555520 is about 3543.3769203967. The cubic root of 12555520 is about 232.4225355684.

Subtracting from 12555520 its reverse (2555521), we obtain a palindrome (9999999).

The spelling of 12555520 in words is "twelve million, five hundred fifty-five thousand, five hundred twenty".