12128565 has 16 divisors (see below), whose sum is σ = 20547648. Its totient is φ = 6087936.

The previous prime is 12128561. The next prime is 12128587. The reversal of 12128565 is 56582121.

It is not a de Polignac number, because 12128565 - 2² = 12128561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12128561) 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 15 ways as a sum of consecutive naturals, for example, 23527 + ... + 24036.

It is an arithmetic number, because the mean of its divisors is an integer number (1284228).

Almost surely, 2^12128565 is an apocalyptic number.

12128565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12128565 is a deficient number, since it is larger than the sum of its proper divisors (8419083).

12128565 is a wasteful number, since it uses less digits than its factorization.

12128565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47588.

The product of its digits is 4800, while the sum is 30.

The square root of 12128565 is about 3482.6089358411. The cubic root of 12128565 is about 229.7575580173.

The spelling of 12128565 in words is "twelve million, one hundred twenty-eight thousand, five hundred sixty-five".