12818642 has 4 divisors (see below), whose sum is σ = 19227966. Its totient is φ = 6409320.

The previous prime is 12818623. The next prime is 12818653. The reversal of 12818642 is 24681821.

It is a happy number.

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., 12397441 + 421201 = 3521^2 + 649^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12818599 and 12818608.

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, 3204659 + ... + 3204662.

Almost surely, 2^12818642 is an apocalyptic number.

12818642 is a deficient number, since it is larger than the sum of its proper divisors (6409324).

12818642 is an equidigital number, since it uses as much as digits as its factorization.

12818642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6409323.

The product of its digits is 6144, while the sum is 32.

The square root of 12818642 is about 3580.3131147988. The cubic root of 12818642 is about 234.0349255099.

The spelling of 12818642 in words is "twelve million, eight hundred eighteen thousand, six hundred forty-two".