12908891 has 4 divisors (see below), whose sum is σ = 13223784. Its totient is φ = 12594000.

The previous prime is 12908873. The next prime is 12908897. The reversal of 12908891 is 19880921.

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 12908891 - 2¹⁸ = 12646747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12908897) 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, 157385 + ... + 157466.

It is an arithmetic number, because the mean of its divisors is an integer number (3305946).

Almost surely, 2^12908891 is an apocalyptic number.

12908891 is a deficient number, since it is larger than the sum of its proper divisors (314893).

12908891 is an equidigital number, since it uses as much as digits as its factorization.

12908891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314892.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 12908891 is about 3592.8945155682. The cubic root of 12908891 is about 234.5828785842.

The spelling of 12908891 in words is "twelve million, nine hundred eight thousand, eight hundred ninety-one".