12128340 has 96 divisors (see below), whose sum is σ = 39481344. Its totient is φ = 2724480.

The previous prime is 12128339. The next prime is 12128357. The reversal of 12128340 is 4382121.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27925 + ... + 28355.

It is an arithmetic number, because the mean of its divisors is an integer number (411264).

Almost surely, 2^12128340 is an apocalyptic number.

12128340 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 12128340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19740672).

12128340 is an abundant number, since it is smaller than the sum of its proper divisors (27353004).

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

12128340 is a wasteful number, since it uses less digits than its factorization.

12128340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 12128340 is about 3482.5766323227. The cubic root of 12128340 is about 229.7561372455.

The spelling of 12128340 in words is "twelve million, one hundred twenty-eight thousand, three hundred forty".