13731318 has 24 divisors (see below), whose sum is σ = 29835000. Its totient is φ = 4564224.

The previous prime is 13731317. The next prime is 13731323. The reversal of 13731318 is 81313731.

It is a plaindrome in base 7.

It is a zygodrome in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 13731291 and 13731300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13731313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7233 + ... + 8931.

It is an arithmetic number, because the mean of its divisors is an integer number (1243125).

Almost surely, 2^13731318 is an apocalyptic number.

13731318 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13731318 is an abundant number, since it is smaller than the sum of its proper divisors (16103682).

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

13731318 is a wasteful number, since it uses less digits than its factorization.

13731318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2156 (or 2153 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 13731318 is about 3705.5793069370. The cubic root of 13731318 is about 239.4624426996.

The spelling of 13731318 in words is "thirteen million, seven hundred thirty-one thousand, three hundred eighteen".