12891847 has 4 divisors (see below), whose sum is σ = 12909016. Its totient is φ = 12874680.

The previous prime is 12891839. The next prime is 12891869. The reversal of 12891847 is 74819821.

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: 74819821 = 199 ⋅375979.

It is a cyclic number.

It is not a de Polignac number, because 12891847 - 2³ = 12891839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12891547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7404 + ... + 8977.

It is an arithmetic number, because the mean of its divisors is an integer number (3227254).

Almost surely, 2^12891847 is an apocalyptic number.

12891847 is a deficient number, since it is larger than the sum of its proper divisors (17169).

12891847 is an equidigital number, since it uses as much as digits as its factorization.

12891847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17168.

The product of its digits is 32256, while the sum is 40.

The square root of 12891847 is about 3590.5218283698. The cubic root of 12891847 is about 234.4795908182.

It can be divided in two parts, 1289 and 1847, that added together give a square (3136 = 56²).

The spelling of 12891847 in words is "twelve million, eight hundred ninety-one thousand, eight hundred forty-seven".