12786458 has 4 divisors (see below), whose sum is σ = 19179690. Its totient is φ = 6393228.

The previous prime is 12786457. The next prime is 12786467. The reversal of 12786458 is 85468721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85468721 = 13 ⋅6574517.

It can be written as a sum of positive squares in only one way, i.e., 8219689 + 4566769 = 2867^2 + 2137^2 .

It is not an unprimeable number, because it can be changed into a prime (12786451) 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, 3196613 + ... + 3196616.

Almost surely, 2^12786458 is an apocalyptic number.

12786458 is a deficient number, since it is larger than the sum of its proper divisors (6393232).

12786458 is an equidigital number, since it uses as much as digits as its factorization.

12786458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6393231.

The product of its digits is 107520, while the sum is 41.

The square root of 12786458 is about 3575.8157111350. The cubic root of 12786458 is about 233.8388960975.

The spelling of 12786458 in words is "twelve million, seven hundred eighty-six thousand, four hundred fifty-eight".