12403440 has 240 divisors, whose sum is σ = 50139648. Its totient is φ = 2686464.

The previous prime is 12403439. The next prime is 12403451. The reversal of 12403440 is 4430421.

12403440 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (18).

12403440 is strictly pandigital in base 8.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 115867 + ... + 115973.

Almost surely, 2^12403440 is an apocalyptic number.

12403440 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 12403440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25069824).

12403440 is an abundant number, since it is smaller than the sum of its proper divisors (37736208).

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

12403440 is a wasteful number, since it uses less digits than its factorization.

12403440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 12403440 is about 3521.8517856378. The cubic root of 12403440 is about 231.4803072004.

Adding to 12403440 its reverse (4430421), we get a palindrome (16833861).

The spelling of 12403440 in words is "twelve million, four hundred three thousand, four hundred forty".