12105428 has 12 divisors (see below), whose sum is σ = 22430772. Its totient is φ = 5696640.

The previous prime is 12105427. The next prime is 12105433. The reversal of 12105428 is 82450121.

It can be written as a sum of positive squares in 2 ways, for example, as 7828804 + 4276624 = 2798^2 + 2068^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12105421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88943 + ... + 89078.

It is an arithmetic number, because the mean of its divisors is an integer number (1869231).

Almost surely, 2^12105428 is an apocalyptic number.

It is an amenable number.

12105428 is a deficient number, since it is larger than the sum of its proper divisors (10325344).

12105428 is a wasteful number, since it uses less digits than its factorization.

12105428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178042 (or 178040 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 12105428 is about 3479.2855588468. The cubic root of 12105428 is about 229.6113663755.

Adding to 12105428 its reverse (82450121), we get a palindrome (94555549).

The spelling of 12105428 in words is "twelve million, one hundred five thousand, four hundred twenty-eight".