12125520 has 120 divisors (see below), whose sum is σ = 44452512. Its totient is φ = 2937600.

The previous prime is 12125497. The next prime is 12125521. The reversal of 12125520 is 2552121.

12125520 is a `hidden beast` number, since 121 + 25 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12125493 and 12125502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12125521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7155 + ... + 8685.

Almost surely, 2^12125520 is an apocalyptic number.

12125520 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 12125520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22226256).

12125520 is an abundant number, since it is smaller than the sum of its proper divisors (32326992).

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

12125520 is a wasteful number, since it uses less digits than its factorization.

12125520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561 (or 1552 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 12125520 is about 3482.1717361440. The cubic root of 12125520 is about 229.7383287482.

Adding to 12125520 its reverse (2552121), we get a palindrome (14677641).

The spelling of 12125520 in words is "twelve million, one hundred twenty-five thousand, five hundred twenty".