12100440 has 128 divisors (see below), whose sum is σ = 40435200. Its totient is φ = 2872320.

The previous prime is 12100411. The next prime is 12100441. The reversal of 12100440 is 4400121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12100441) 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 31 ways as a sum of consecutive naturals, for example, 117429 + ... + 117531.

It is an arithmetic number, because the mean of its divisors is an integer number (315900).

Almost surely, 2^12100440 is an apocalyptic number.

12100440 is a gapful number since it is divisible by the number (10) 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 12100440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20217600).

12100440 is an abundant number, since it is smaller than the sum of its proper divisors (28334760).

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

12100440 is a wasteful number, since it uses less digits than its factorization.

12100440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 213 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 12100440 is about 3478.5686711635. The cubic root of 12100440 is about 229.5798251849.

Adding to 12100440 its reverse (4400121), we get a palindrome (16500561).

The spelling of 12100440 in words is "twelve million, one hundred thousand, four hundred forty".