12818818 has 4 divisors (see below), whose sum is σ = 19228230. Its totient is φ = 6409408.

The previous prime is 12818807. The next prime is 12818849. The reversal of 12818818 is 81881821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81881821 = 7 ⋅11697403.

It can be written as a sum of positive squares in only one way, i.e., 8311689 + 4507129 = 2883^2 + 2123^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3204703 + ... + 3204706.

Almost surely, 2^12818818 is an apocalyptic number.

12818818 is a deficient number, since it is larger than the sum of its proper divisors (6409412).

12818818 is an equidigital number, since it uses as much as digits as its factorization.

12818818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6409411.

The product of its digits is 8192, while the sum is 37.

The square root of 12818818 is about 3580.3376935703. The cubic root of 12818818 is about 234.0359966051.

It can be divided in two parts, 128 and 18818, that multiplied together give a square (2408704 = 1552²).

The spelling of 12818818 in words is "twelve million, eight hundred eighteen thousand, eight hundred eighteen".