12781408 has 24 divisors (see below), whose sum is σ = 25363800. Its totient is φ = 6339840.

The previous prime is 12781367. The next prime is 12781411. The reversal of 12781408 is 80418721.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 12781408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2668 + ... + 5716.

It is an arithmetic number, because the mean of its divisors is an integer number (1056825).

Almost surely, 2^12781408 is an apocalyptic number.

It is an amenable number.

12781408 is a deficient number, since it is larger than the sum of its proper divisors (12582392).

12781408 is a wasteful number, since it uses less digits than its factorization.

12781408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3190 (or 3182 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 12781408 is about 3575.1095088123. The cubic root of 12781408 is about 233.8081072238.

The spelling of 12781408 in words is "twelve million, seven hundred eighty-one thousand, four hundred eight".