12891906 has 32 divisors (see below), whose sum is σ = 28828800. Its totient is φ = 4270320.

The previous prime is 12891881. The next prime is 12891929. The reversal of 12891906 is 60919821.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9115 + ... + 10433.

It is an arithmetic number, because the mean of its divisors is an integer number (900900).

Almost surely, 2^12891906 is an apocalyptic number.

12891906 is an abundant number, since it is smaller than the sum of its proper divisors (15936894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12891906 is a wasteful number, since it uses less digits than its factorization.

12891906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1511 (or 1505 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 12891906 is about 3590.5300444363. The cubic root of 12891906 is about 234.4799485191.

The spelling of 12891906 in words is "twelve million, eight hundred ninety-one thousand, nine hundred six".