12909187 has 8 divisors (see below), whose sum is σ = 13508640. Its totient is φ = 12336280.

The previous prime is 12909179. The next prime is 12909217. The reversal of 12909187 is 78190921.

12909187 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12909187 - 2³ = 12909179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12909587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11637 + ... + 12697.

It is an arithmetic number, because the mean of its divisors is an integer number (1688580).

Almost surely, 2^12909187 is an apocalyptic number.

12909187 is a deficient number, since it is larger than the sum of its proper divisors (599453).

12909187 is an frugal number, since it uses more digits than its factorization.

12909187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130 (or 1084 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 12909187 is about 3592.9357077465. The cubic root of 12909187 is about 234.5846715603.

The spelling of 12909187 in words is "twelve million, nine hundred nine thousand, one hundred eighty-seven".