12043840 has 56 divisors (see below), whose sum is σ = 29196792. Its totient is φ = 4730880.

The previous prime is 12043831. The next prime is 12043909. The reversal of 12043840 is 4834021.

It can be written as a sum of positive squares in 4 ways, for example, as 968256 + 11075584 = 984^2 + 3328^2 .

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 19212 + ... + 19828.

Almost surely, 2^12043840 is an apocalyptic number.

12043840 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 12043840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14598396).

12043840 is an abundant number, since it is smaller than the sum of its proper divisors (17152952).

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

12043840 is an equidigital number, since it uses as much as digits as its factorization.

12043840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695 (or 685 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 12043840 is about 3470.4236052678. The cubic root of 12043840 is about 229.2213111931.

Adding to 12043840 its reverse (4834021), we get a palindrome (16877861).

The spelling of 12043840 in words is "twelve million, forty-three thousand, eight hundred forty".