12722128 has 40 divisors (see below), whose sum is σ = 25998336. Its totient is φ = 6019200.

The previous prime is 12722123. The next prime is 12722131. The reversal of 12722128 is 82122721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12722123) 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 7 ways as a sum of consecutive naturals, for example, 66513 + ... + 66703.

Almost surely, 2^12722128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12722128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12999168).

12722128 is an abundant number, since it is smaller than the sum of its proper divisors (13276208).

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

12722128 is a wasteful number, since it uses less digits than its factorization.

12722128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403 (or 397 counting only the distinct ones).

The product of its digits is 896, while the sum is 25.

The square root of 12722128 is about 3566.8092183351. The cubic root of 12722128 is about 233.4460806588.

Adding to 12722128 its reverse (82122721), we get a palindrome (94844849).

The spelling of 12722128 in words is "twelve million, seven hundred twenty-two thousand, one hundred twenty-eight".