8394221 has 4 divisors (see below), whose sum is σ = 9157344. Its totient is φ = 7631100.

The previous prime is 8394187. The next prime is 8394223. The reversal of 8394221 is 1224938.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8394221 - 2¹⁸ = 8132077 is a prime.

It is a d-powerful number, because it can be written as 8³ + 3⁵ + 9³ + 4⁶ + 2⁵ + 2²³ + 1 .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8394223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381545 + ... + 381566.

It is an arithmetic number, because the mean of its divisors is an integer number (2289336).

Almost surely, 2^8394221 is an apocalyptic number.

It is an amenable number.

8394221 is a deficient number, since it is larger than the sum of its proper divisors (763123).

8394221 is a wasteful number, since it uses less digits than its factorization.

8394221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763122.

The product of its digits is 3456, while the sum is 29.

The square root of 8394221 is about 2897.2782054887. The cubic root of 8394221 is about 203.2326435688.

The spelling of 8394221 in words is "eight million, three hundred ninety-four thousand, two hundred twenty-one".