13856818 has 4 divisors (see below), whose sum is σ = 20785230. Its totient is φ = 6928408.

The previous prime is 13856789. The next prime is 13856831. The reversal of 13856818 is 81865831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 8254129 + 5602689 = 2873^2 + 2367^2 .

It is a super-2 number, since 2×13856818² = 384022810170248, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 15.

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 as a sum of consecutive naturals, namely, 3464203 + ... + 3464206.

Almost surely, 2^13856818 is an apocalyptic number.

13856818 is a deficient number, since it is larger than the sum of its proper divisors (6928412).

13856818 is an equidigital number, since it uses as much as digits as its factorization.

13856818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6928411.

The product of its digits is 46080, while the sum is 40.

The square root of 13856818 is about 3722.4747144877. The cubic root of 13856818 is about 240.1897688910.

The spelling of 13856818 in words is "thirteen million, eight hundred fifty-six thousand, eight hundred eighteen".