12891867 has 4 divisors (see below), whose sum is σ = 17189160. Its totient is φ = 8594576.

The previous prime is 12891839. The next prime is 12891869. The reversal of 12891867 is 76819821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12891867 - 2⁶ = 12891803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12891869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2148642 + ... + 2148647.

It is an arithmetic number, because the mean of its divisors is an integer number (4297290).

Almost surely, 2^12891867 is an apocalyptic number.

12891867 is a deficient number, since it is larger than the sum of its proper divisors (4297293).

12891867 is an equidigital number, since it uses as much as digits as its factorization.

12891867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4297292.

The product of its digits is 48384, while the sum is 42.

The square root of 12891867 is about 3590.5246134792. The cubic root of 12891867 is about 234.4797120729.

The spelling of 12891867 in words is "twelve million, eight hundred ninety-one thousand, eight hundred sixty-seven".