12744840 has 32 divisors (see below), whose sum is σ = 38234880. Its totient is φ = 3398592.

The previous prime is 12744821. The next prime is 12744847. The reversal of 12744840 is 4844721.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 12744798 and 12744807.

It is not an unprimeable number, because it can be changed into a prime (12744847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52984 + ... + 53223.

It is an arithmetic number, because the mean of its divisors is an integer number (1194840).

Almost surely, 2^12744840 is an apocalyptic number.

12744840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12744840 is an abundant number, since it is smaller than the sum of its proper divisors (25490040).

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

12744840 is a wasteful number, since it uses less digits than its factorization.

12744840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106221 (or 106217 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 30.

The square root of 12744840 is about 3569.9915966288. The cubic root of 12744840 is about 233.5849168500.

The spelling of 12744840 in words is "twelve million, seven hundred forty-four thousand, eight hundred forty".