12100428 has 72 divisors (see below), whose sum is σ = 32410560. Its totient is φ = 3946320.

The previous prime is 12100411. The next prime is 12100441. The reversal of 12100428 is 82400121.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 12100428.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 57243 + ... + 57453.

Almost surely, 2^12100428 is an apocalyptic number.

12100428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12100428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16205280).

12100428 is an abundant number, since it is smaller than the sum of its proper divisors (20310132).

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

12100428 is a wasteful number, since it uses less digits than its factorization.

12100428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289 (or 275 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 12100428 is about 3478.5669463157. The cubic root of 12100428 is about 229.5797492934.

Adding to 12100428 its reverse (82400121), we get a palindrome (94500549).

The spelling of 12100428 in words is "twelve million, one hundred thousand, four hundred twenty-eight".