12128940 has 60 divisors (see below), whose sum is σ = 38054016. Its totient is φ = 3233952.

The previous prime is 12128929. The next prime is 12128947. The reversal of 12128940 is 4982121.

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×12128940² = 294222371047200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12128947) 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 19 ways as a sum of consecutive naturals, for example, 2124 + ... + 5363.

Almost surely, 2^12128940 is an apocalyptic number.

12128940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12128940 is an abundant number, since it is smaller than the sum of its proper divisors (25925076).

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

12128940 is a wasteful number, since it uses less digits than its factorization.

12128940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7508 (or 7497 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 12128940 is about 3482.6627743725. The cubic root of 12128940 is about 229.7599259313.

The spelling of 12128940 in words is "twelve million, one hundred twenty-eight thousand, nine hundred forty".