12813818 has 16 divisors (see below), whose sum is σ = 20554560. Its totient is φ = 5969856.

The previous prime is 12813791. The next prime is 12813833. The reversal of 12813818 is 81831821.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 1673 + ... + 5331.

It is an arithmetic number, because the mean of its divisors is an integer number (1284660).

Almost surely, 2^12813818 is an apocalyptic number.

12813818 is a deficient number, since it is larger than the sum of its proper divisors (7740742).

12813818 is a wasteful number, since it uses less digits than its factorization.

12813818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3781.

The product of its digits is 3072, while the sum is 32.

The square root of 12813818 is about 3579.6393673106. The cubic root of 12813818 is about 234.0055639459.

It can be divided in two parts, 12813 and 818, that added together give a palindrome (13631).

The spelling of 12813818 in words is "twelve million, eight hundred thirteen thousand, eight hundred eighteen".