12011428 has 72 divisors (see below), whose sum is σ = 26276544. Its totient is φ = 4762560.

The previous prime is 12011411. The next prime is 12011459. The reversal of 12011428 is 82411021.

It is a happy number.

It is a congruent number.

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 in 23 ways as a sum of consecutive naturals, for example, 144675 + ... + 144757.

It is an arithmetic number, because the mean of its divisors is an integer number (364952).

Almost surely, 2^12011428 is an apocalyptic number.

It is an amenable number.

12011428 is an abundant number, since it is smaller than the sum of its proper divisors (14265116).

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

12011428 is a wasteful number, since it uses less digits than its factorization.

12011428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 12011428 is about 3465.7507123277. The cubic root of 12011428 is about 229.0155020874.

Adding to 12011428 its reverse (82411021), we get a palindrome (94422449).

The spelling of 12011428 in words is "twelve million, eleven thousand, four hundred twenty-eight".