12128500 has 48 divisors (see below), whose sum is σ = 26836992. Its totient is φ = 4788000.

The previous prime is 12128483. The next prime is 12128507. The reversal of 12128500 is 582121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12128507) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 63405 + ... + 63595.

It is an arithmetic number, because the mean of its divisors is an integer number (559104).

Almost surely, 2^12128500 is an apocalyptic number.

12128500 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 12128500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13418496).

12128500 is an abundant number, since it is smaller than the sum of its proper divisors (14708492).

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

12128500 is a wasteful number, since it uses less digits than its factorization.

12128500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337 (or 325 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 12128500 is about 3482.5996037443. The cubic root of 12128500 is about 229.7571475739.

The spelling of 12128500 in words is "twelve million, one hundred twenty-eight thousand, five hundred".