8409021 has 8 divisors (see below), whose sum is σ = 11298144. Its totient is φ = 5562960.

The previous prime is 8409019. The next prime is 8409041. The reversal of 8409021 is 1209048.

8409021 is digitally balanced in base 2, 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 not a de Polignac number, because 8409021 - 2¹ = 8409019 is a prime.

8409021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 8408982 and 8409000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8409041) 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, 10306 + ... + 11091.

It is an arithmetic number, because the mean of its divisors is an integer number (1412268).

Almost surely, 2^8409021 is an apocalyptic number.

It is an amenable number.

8409021 is a deficient number, since it is larger than the sum of its proper divisors (2889123).

8409021 is a wasteful number, since it uses less digits than its factorization.

8409021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21531.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 8409021 is about 2899.8312019840. The cubic root of 8409021 is about 203.3520144680.

The spelling of 8409021 in words is "eight million, four hundred nine thousand, twenty-one".