12818738 has 4 divisors (see below), whose sum is σ = 19228110. Its totient is φ = 6409368.

The previous prime is 12818737. The next prime is 12818747. The reversal of 12818738 is 83781821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83781821 = 709 ⋅118169.

It can be written as a sum of positive squares in only one way, i.e., 7991929 + 4826809 = 2827^2 + 2197^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12818737) by changing a digit.

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, 3204683 + ... + 3204686.

Almost surely, 2^12818738 is an apocalyptic number.

12818738 is a deficient number, since it is larger than the sum of its proper divisors (6409372).

12818738 is an equidigital number, since it uses as much as digits as its factorization.

12818738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6409371.

The product of its digits is 21504, while the sum is 38.

The square root of 12818738 is about 3580.3265214223. The cubic root of 12818738 is about 234.0355097449.

The spelling of 12818738 in words is "twelve million, eight hundred eighteen thousand, seven hundred thirty-eight".