42394221 has 12 divisors (see below), whose sum is σ = 63898848. Its totient is φ = 27033864.

The previous prime is 42394217. The next prime is 42394229. The reversal of 42394221 is 12249324.

42394221 is a `hidden beast` number, since 4 + 239 + 422 + 1 = 666.

42394221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42394221 - 2² = 42394217 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42394229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102195 + ... + 102608.

It is an arithmetic number, because the mean of its divisors is an integer number (5324904).

Almost surely, 2^42394221 is an apocalyptic number.

It is an amenable number.

42394221 is a deficient number, since it is larger than the sum of its proper divisors (21504627).

42394221 is a wasteful number, since it uses less digits than its factorization.

42394221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204832 (or 204829 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 42394221 is about 6511.0844718833. The cubic root of 42394221 is about 348.6868371371.

The spelling of 42394221 in words is "forty-two million, three hundred ninety-four thousand, two hundred twenty-one".