8209421 has 8 divisors (see below), whose sum is σ = 8997600. Its totient is φ = 7428240.

The previous prime is 8209391. The next prime is 8209429. The reversal of 8209421 is 1249028.

8209421 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 8209421 - 2²² = 4015117 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 (8209429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 890 + ... + 4148.

It is an arithmetic number, because the mean of its divisors is an integer number (1124700).

Almost surely, 2^8209421 is an apocalyptic number.

It is an amenable number.

8209421 is a deficient number, since it is larger than the sum of its proper divisors (788179).

8209421 is a wasteful number, since it uses less digits than its factorization.

8209421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3499.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 8209421 is about 2865.2087184008. The cubic root of 8209421 is about 201.7301644942.

The spelling of 8209421 in words is "eight million, two hundred nine thousand, four hundred twenty-one".