8021909 has 8 divisors (see below), whose sum is σ = 9707328. Its totient is φ = 6471360.

The previous prime is 8021887. The next prime is 8021911. The reversal of 8021909 is 9091208.

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

It is not a de Polignac number, because 8021909 - 2¹⁶ = 7956373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8021939) 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, 33587 + ... + 33824.

It is an arithmetic number, because the mean of its divisors is an integer number (1213416).

Almost surely, 2^8021909 is an apocalyptic number.

It is an amenable number.

8021909 is a deficient number, since it is larger than the sum of its proper divisors (1685419).

8021909 is a wasteful number, since it uses less digits than its factorization.

8021909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67435.

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

The square root of 8021909 is about 2832.2974773141. The cubic root of 8021909 is about 200.1824085850.

The spelling of 8021909 in words is "eight million, twenty-one thousand, nine hundred nine".