12103440 has 160 divisors (see below), whose sum is σ = 40711680. Its totient is φ = 2967552.

The previous prime is 12103433. The next prime is 12103447. The reversal of 12103440 is 4430121.

It is a Cunningham number, because it is equal to 3479²-1.

It is an interprime number because it is at equal distance from previous prime (12103433) and next prime (12103447).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12103447) 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, 257497 + ... + 257543.

It is an arithmetic number, because the mean of its divisors is an integer number (254448).

Almost surely, 2^12103440 is an apocalyptic number.

12103440 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 12103440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20355840).

12103440 is an abundant number, since it is smaller than the sum of its proper divisors (28608240).

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

12103440 is a wasteful number, since it uses less digits than its factorization.

12103440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 12103440 is about 3478.9998562805. Note that the first 3 decimals coincide. The cubic root of 12103440 is about 229.5987964665.

Adding to 12103440 its reverse (4430121), we get a palindrome (16533561).

The spelling of 12103440 in words is "twelve million, one hundred three thousand, four hundred forty".