12128700 has 36 divisors (see below), whose sum is σ = 35093240. Its totient is φ = 3234240.

The previous prime is 12128693. The next prime is 12128713. The reversal of 12128700 is 782121.

Added to its reverse (782121) it gives a triangular number (12910821 = T₅₀₈₁).

12128700 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19915 + ... + 20514.

Almost surely, 2^12128700 is an apocalyptic number.

12128700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12128700 is an abundant number, since it is smaller than the sum of its proper divisors (22964540).

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

12128700 is a wasteful number, since it uses less digits than its factorization.

12128700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40446 (or 40439 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 12128700 is about 3482.6283178083. The cubic root of 12128700 is about 229.7584104720.

Adding to 12128700 its reverse (782121), we get a triangular number (12910821 = T₅₀₈₁).

The spelling of 12128700 in words is "twelve million, one hundred twenty-eight thousand, seven hundred".