12143440 has 40 divisors (see below), whose sum is σ = 29897640. Its totient is φ = 4571136.

The previous prime is 12143429. The next prime is 12143441. The reversal of 12143440 is 4434121.

It can be written as a sum of positive squares in 4 ways, for example, as 364816 + 11778624 = 604^2 + 3432^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12143441) 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 7 ways as a sum of consecutive naturals, for example, 3105 + ... + 5824.

It is an arithmetic number, because the mean of its divisors is an integer number (747441).

Almost surely, 2^12143440 is an apocalyptic number.

12143440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12143440 is an abundant number, since it is smaller than the sum of its proper divisors (17754200).

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

12143440 is a wasteful number, since it uses less digits than its factorization.

12143440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8959 (or 8953 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 12143440 is about 3484.7438930286. The cubic root of 12143440 is about 229.8514478673.

Adding to 12143440 its reverse (4434121), we get a palindrome (16577561).

The spelling of 12143440 in words is "twelve million, one hundred forty-three thousand, four hundred forty".