12787018 has 4 divisors (see below), whose sum is σ = 19180530. Its totient is φ = 6393508.

The previous prime is 12787001. The next prime is 12787051. The reversal of 12787018 is 81078721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81078721 = 193 ⋅420097.

It can be written as a sum of positive squares in only one way, i.e., 12229009 + 558009 = 3497^2 + 747^2 .

It is an alternating number because its digits alternate between odd and even.

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, 3196753 + ... + 3196756.

Almost surely, 2^12787018 is an apocalyptic number.

12787018 is a deficient number, since it is larger than the sum of its proper divisors (6393512).

12787018 is an equidigital number, since it uses as much as digits as its factorization.

12787018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6393511.

The product of its (nonzero) digits is 6272, while the sum is 34.

The square root of 12787018 is about 3575.8940140893. The cubic root of 12787018 is about 233.8423098099.

The spelling of 12787018 in words is "twelve million, seven hundred eighty-seven thousand, eighteen".