394221 has 8 divisors (see below), whose sum is σ = 528544. Its totient is φ = 261360.

The previous prime is 394211. The next prime is 394223. The reversal of 394221 is 122493.

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

It is not a de Polignac number, because 394221 - 2⁶ = 394157 is a prime.

It is a d-powerful number, because it can be written as 3⁵ + 9³ + 2⁵ + 4⁹ + 2¹⁷ + 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 (394223) 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, 795 + ... + 1191.

It is an arithmetic number, because the mean of its divisors is an integer number (66068).

2³⁹⁴²²¹ is an apocalyptic number.

It is an amenable number.

394221 is a deficient number, since it is larger than the sum of its proper divisors (134323).

394221 is a wasteful number, since it uses less digits than its factorization.

394221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731.

The product of its digits is 432, while the sum is 21.

The square root of 394221 is about 627.8702095179. The cubic root of 394221 is about 73.3240736702.

The spelling of 394221 in words is "three hundred ninety-four thousand, two hundred twenty-one".