8120909 has 8 divisors (see below), whose sum is σ = 8595072. Its totient is φ = 7656880.

The previous prime is 8120891. The next prime is 8120921. The reversal of 8120909 is 9090218.

8120909 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 8120909 - 2⁸ = 8120653 is a prime.

It is a Duffinian number.

8120909 is a modest number, since divided by 909 gives 812 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8120209) 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, 854 + ... + 4119.

It is an arithmetic number, because the mean of its divisors is an integer number (1074384).

Almost surely, 2^8120909 is an apocalyptic number.

It is an amenable number.

8120909 is a deficient number, since it is larger than the sum of its proper divisors (474163).

8120909 is a wasteful number, since it uses less digits than its factorization.

8120909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5067.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 8120909 is about 2849.7208635233. The cubic root of 8120909 is about 201.0025411591.

The spelling of 8120909 in words is "eight million, one hundred twenty thousand, nine hundred nine".