12912520 has 48 divisors (see below), whose sum is σ = 30890340. Its totient is φ = 4856832.

The previous prime is 12912509. The next prime is 12912527. The reversal of 12912520 is 2521921.

It can be written as a sum of positive squares in 6 ways, for example, as 5654884 + 7257636 = 2378^2 + 2694^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12912491 and 12912500.

It is not an unprimeable number, because it can be changed into a prime (12912527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11002 + ... + 12118.

Almost surely, 2^12912520 is an apocalyptic number.

12912520 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 12912520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15445170).

12912520 is an abundant number, since it is smaller than the sum of its proper divisors (17977820).

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

12912520 is a wasteful number, since it uses less digits than its factorization.

12912520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162 (or 1141 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 12912520 is about 3593.3995046474. The cubic root of 12912520 is about 234.6048588226.

The spelling of 12912520 in words is "twelve million, nine hundred twelve thousand, five hundred twenty".