12891238 has 4 divisors (see below), whose sum is σ = 19336860. Its totient is φ = 6445618.

The previous prime is 12891233. The next prime is 12891251. The reversal of 12891238 is 83219821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83219821 = 29 ⋅2869649.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12891233) 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, 3222808 + ... + 3222811.

It is an arithmetic number, because the mean of its divisors is an integer number (4834215).

Almost surely, 2^12891238 is an apocalyptic number.

12891238 is a deficient number, since it is larger than the sum of its proper divisors (6445622).

12891238 is an equidigital number, since it uses as much as digits as its factorization.

12891238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6445621.

The product of its digits is 6912, while the sum is 34.

The square root of 12891238 is about 3590.4370207539. The cubic root of 12891238 is about 234.4758985539.

The spelling of 12891238 in words is "twelve million, eight hundred ninety-one thousand, two hundred thirty-eight".