13691808 has 192 divisors, whose sum is σ = 45722880. Its totient is φ = 3953664.

The previous prime is 13691803. The next prime is 13691809. The reversal of 13691808 is 80819631.

It is a Smith number, since the sum of its digits (36) 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 (36).

It is not an unprimeable number, because it can be changed into a prime (13691803) 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 31 ways as a sum of consecutive naturals, for example, 258310 + ... + 258362.

It is an arithmetic number, because the mean of its divisors is an integer number (238140).

Almost surely, 2^13691808 is an apocalyptic number.

13691808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13691808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22861440).

13691808 is an abundant number, since it is smaller than the sum of its proper divisors (32031072).

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

13691808 is a wasteful number, since it uses less digits than its factorization.

13691808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 13691808 is about 3700.2443162580. The cubic root of 13691808 is about 239.2325485251.

The spelling of 13691808 in words is "thirteen million, six hundred ninety-one thousand, eight hundred eight".