12909155 has 8 divisors (see below), whose sum is σ = 17704032. Its totient is φ = 8851968.

The previous prime is 12909139. The next prime is 12909163. The reversal of 12909155 is 55190921.

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

It is a cyclic number.

It is not a de Polignac number, because 12909155 - 2⁴ = 12909139 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184382 + ... + 184451.

It is an arithmetic number, because the mean of its divisors is an integer number (2213004).

Almost surely, 2^12909155 is an apocalyptic number.

12909155 is a deficient number, since it is larger than the sum of its proper divisors (4794877).

12909155 is an equidigital number, since it uses as much as digits as its factorization.

12909155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368845.

The product of its (nonzero) digits is 4050, while the sum is 32.

The square root of 12909155 is about 3592.9312545608. The cubic root of 12909155 is about 234.5844777264.

The spelling of 12909155 in words is "twelve million, nine hundred nine thousand, one hundred fifty-five".