13731818 has 8 divisors (see below), whose sum is σ = 21809412. Its totient is φ = 6462016.

The previous prime is 13731799. The next prime is 13731821. The reversal of 13731818 is 81813731.

It can be written as a sum of positive squares in 2 ways, for example, as 13667809 + 64009 = 3697^2 + 253^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 201905 + ... + 201972.

Almost surely, 2^13731818 is an apocalyptic number.

13731818 is a deficient number, since it is larger than the sum of its proper divisors (8077594).

13731818 is a wasteful number, since it uses less digits than its factorization.

13731818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403896.

The product of its digits is 4032, while the sum is 32.

The square root of 13731818 is about 3705.6467721573. The cubic root of 13731818 is about 239.4653491884.

The spelling of 13731818 in words is "thirteen million, seven hundred thirty-one thousand, eight hundred eighteen".