12003440 has 80 divisors (see below), whose sum is σ = 30132000. Its totient is φ = 4432896.

The previous prime is 12003437. The next prime is 12003449. The reversal of 12003440 is 4430021.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12003449) 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 15 ways as a sum of consecutive naturals, for example, 80486 + ... + 80634.

It is an arithmetic number, because the mean of its divisors is an integer number (376650).

Almost surely, 2^12003440 is an apocalyptic number.

12003440 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 12003440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15066000).

12003440 is an abundant number, since it is smaller than the sum of its proper divisors (18128560).

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

12003440 is a wasteful number, since it uses less digits than its factorization.

12003440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 12003440 is about 3464.5981007903. The cubic root of 12003440 is about 228.9647231816.

Adding to 12003440 its reverse (4430021), we get a palindrome (16433461).

The spelling of 12003440 in words is "twelve million, three thousand, four hundred forty".