12431440 has 80 divisors (see below), whose sum is σ = 33569280. Its totient is φ = 4193280.

The previous prime is 12431413. The next prime is 12431443. The reversal of 12431440 is 4413421.

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 (12431443) 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, 44100 + ... + 44380.

It is an arithmetic number, because the mean of its divisors is an integer number (419616).

Almost surely, 2^12431440 is an apocalyptic number.

12431440 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 12431440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16784640).

12431440 is an abundant number, since it is smaller than the sum of its proper divisors (21137840).

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

12431440 is a wasteful number, since it uses less digits than its factorization.

12431440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380 (or 374 counting only the distinct ones).

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

The square root of 12431440 is about 3525.8247262165. The cubic root of 12431440 is about 231.6543604617.

Adding to 12431440 its reverse (4413421), we get a palindrome (16844861).

The spelling of 12431440 in words is "twelve million, four hundred thirty-one thousand, four hundred forty".