13681408 has 36 divisors (see below), whose sum is σ = 29417248. Its totient is φ = 6312960.

The previous prime is 13681399. The next prime is 13681429. The reversal of 13681408 is 80418631.

It is a self number, because there is not a number n which added to its sum of digits gives 13681408.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1273 + ... + 5383.

Almost surely, 2^13681408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13681408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14708624).

13681408 is an abundant number, since it is smaller than the sum of its proper divisors (15735840).

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

13681408 is an equidigital number, since it uses as much as digits as its factorization.

13681408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4140 (or 4126 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 13681408 is about 3698.8387366848. The cubic root of 13681408 is about 239.1719612329.

The spelling of 13681408 in words is "thirteen million, six hundred eighty-one thousand, four hundred eight".