12406440 has 32 divisors (see below), whose sum is σ = 37219680. Its totient is φ = 3308352.

The previous prime is 12406421. The next prime is 12406441. The reversal of 12406440 is 4460421.

It is not an unprimeable number, because it can be changed into a prime (12406441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51574 + ... + 51813.

It is an arithmetic number, because the mean of its divisors is an integer number (1163115).

Almost surely, 2^12406440 is an apocalyptic number.

12406440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12406440 is an abundant number, since it is smaller than the sum of its proper divisors (24813240).

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

12406440 is a wasteful number, since it uses less digits than its factorization.

12406440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103401 (or 103397 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 12406440 is about 3522.2776721888. The cubic root of 12406440 is about 231.4989682853.

Adding to 12406440 its reverse (4460421), we get a palindrome (16866861).

The spelling of 12406440 in words is "twelve million, four hundred six thousand, four hundred forty".