12307128 has 16 divisors (see below), whose sum is σ = 30767880. Its totient is φ = 4102368.

The previous prime is 12307109. The next prime is 12307171. The reversal of 12307128 is 82170321.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 512797 = 12307128 / (1 + 2 + 3 + 0 + 7 + 1 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 12307098 and 12307107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256375 + ... + 256422.

Almost surely, 2^12307128 is an apocalyptic number.

It is an amenable number.

12307128 is an abundant number, since it is smaller than the sum of its proper divisors (18460752).

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

12307128 is a wasteful number, since it uses less digits than its factorization.

12307128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512806 (or 512802 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 12307128 is about 3508.1516500858. The cubic root of 12307128 is about 230.8796059350.

Adding to 12307128 its reverse (82170321), we get a palindrome (94477449).

The spelling of 12307128 in words is "twelve million, three hundred seven thousand, one hundred twenty-eight".