13681388 has 54 divisors (see below), whose sum is σ = 29192436. Its totient is φ = 5593056.

The previous prime is 13681363. The next prime is 13681397. The reversal of 13681388 is 88318631.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 164795 + ... + 164877.

Almost surely, 2^13681388 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 13681388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14596218).

13681388 is an abundant number, since it is smaller than the sum of its proper divisors (15511048).

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

13681388 is a wasteful number, since it uses less digits than its factorization.

13681388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159 (or 121 counting only the distinct ones).

The product of its digits is 27648, while the sum is 38.

The square root of 13681388 is about 3698.8360331326. The cubic root of 13681388 is about 239.1718446893.

The spelling of 13681388 in words is "thirteen million, six hundred eighty-one thousand, three hundred eighty-eight".