12863138 has 4 divisors (see below), whose sum is σ = 19294710. Its totient is φ = 6431568.

The previous prime is 12863117. The next prime is 12863173. The reversal of 12863138 is 83136821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83136821 = 593 ⋅140197.

It can be written as a sum of positive squares in only one way, i.e., 11242609 + 1620529 = 3353^2 + 1273^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3215783 + ... + 3215786.

Almost surely, 2^12863138 is an apocalyptic number.

12863138 is a deficient number, since it is larger than the sum of its proper divisors (6431572).

12863138 is an equidigital number, since it uses as much as digits as its factorization.

12863138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6431571.

The product of its digits is 6912, while the sum is 32.

The square root of 12863138 is about 3586.5217133039. The cubic root of 12863138 is about 234.3054063715.

Adding to 12863138 its reverse (83136821), we get a palindrome (95999959).

The spelling of 12863138 in words is "twelve million, eight hundred sixty-three thousand, one hundred thirty-eight".