12918440 has 32 divisors (see below), whose sum is σ = 29306880. Its totient is φ = 5124672.

The previous prime is 12918421. The next prime is 12918443. The reversal of 12918440 is 4481921.

It is not an unprimeable number, because it can be changed into a prime (12918443) 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, 3809 + ... + 6351.

It is an arithmetic number, because the mean of its divisors is an integer number (915840).

Almost surely, 2^12918440 is an apocalyptic number.

12918440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12918440 is an abundant number, since it is smaller than the sum of its proper divisors (16388440).

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

12918440 is a wasteful number, since it uses less digits than its factorization.

12918440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2681 (or 2677 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 12918440 is about 3594.2231427667. The cubic root of 12918440 is about 234.6407064229.

The spelling of 12918440 in words is "twelve million, nine hundred eighteen thousand, four hundred forty".