12128787 has 24 divisors (see below), whose sum is σ = 19317168. Its totient is φ = 7272000.

The previous prime is 12128777. The next prime is 12128801. The reversal of 12128787 is 78782121.

12128787 = 18³ + 19³ + ... + 83³.

It is a happy number.

It is not a de Polignac number, because 12128787 - 2¹⁴ = 12112403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12128777) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9393 + ... + 10605.

It is an arithmetic number, because the mean of its divisors is an integer number (804882).

Almost surely, 2^12128787 is an apocalyptic number.

12128787 is a deficient number, since it is larger than the sum of its proper divisors (7188381).

12128787 is a wasteful number, since it uses less digits than its factorization.

12128787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331 (or 1328 counting only the distinct ones).

The product of its digits is 12544, while the sum is 36.

The square root of 12128787 is about 3482.6408083522. The cubic root of 12128787 is about 229.7589598283.

It can be divided in two parts, 1212 and 8787, that added together give a palindrome (9999).

The spelling of 12128787 in words is "twelve million, one hundred twenty-eight thousand, seven hundred eighty-seven".