12642891 has 8 divisors (see below), whose sum is σ = 16880640. Its totient is φ = 8416872.

The previous prime is 12642881. The next prime is 12642901. The reversal of 12642891 is 19824621.

It is an interprime number because it is at equal distance from previous prime (12642881) and next prime (12642901).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12642891 - 2⁶ = 12642827 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (12642841) 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 in 7 ways as a sum of consecutive naturals, for example, 6 + ... + 5028.

It is an arithmetic number, because the mean of its divisors is an integer number (2110080).

Almost surely, 2^12642891 is an apocalyptic number.

12642891 is a deficient number, since it is larger than the sum of its proper divisors (4237749).

12642891 is an equidigital number, since it uses as much as digits as its factorization.

12642891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5865.

The product of its digits is 6912, while the sum is 33.

The square root of 12642891 is about 3555.6843223211. The cubic root of 12642891 is about 232.9604149689.

The spelling of 12642891 in words is "twelve million, six hundred forty-two thousand, eight hundred ninety-one".