12505018 has 4 divisors (see below), whose sum is σ = 18757530. Its totient is φ = 6252508.

The previous prime is 12504977. The next prime is 12505037. The reversal of 12505018 is 81050521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81050521 = 401 ⋅202121.

It can be written as a sum of positive squares in only one way, i.e., 7634169 + 4870849 = 2763^2 + 2207^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 12505018.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3126253 + ... + 3126256.

Almost surely, 2^12505018 is an apocalyptic number.

12505018 is a deficient number, since it is larger than the sum of its proper divisors (6252512).

12505018 is an equidigital number, since it uses as much as digits as its factorization.

12505018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6252511.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 12505018 is about 3536.2434870919. The cubic root of 12505018 is about 232.1104928496.

Adding to 12505018 its reverse (81050521), we get a palindrome (93555539).

The spelling of 12505018 in words is "twelve million, five hundred five thousand, eighteen".