12123428 has 6 divisors (see below), whose sum is σ = 21216006. Its totient is φ = 6061712.

The previous prime is 12123373. The next prime is 12123439. The reversal of 12123428 is 82432121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12054784 + 68644 = 3472^2 + 262^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1515425 + ... + 1515432.

It is an arithmetic number, because the mean of its divisors is an integer number (3536001).

Almost surely, 2^12123428 is an apocalyptic number.

It is an amenable number.

12123428 is a deficient number, since it is larger than the sum of its proper divisors (9092578).

12123428 is a wasteful number, since it uses less digits than its factorization.

12123428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030861 (or 3030859 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 12123428 is about 3481.8713359342. The cubic root of 12123428 is about 229.7251158379.

Adding to 12123428 its reverse (82432121), we get a palindrome (94555549).

The spelling of 12123428 in words is "twelve million, one hundred twenty-three thousand, four hundred twenty-eight".