442405221 has 16 divisors (see below), whose sum is σ = 600497664. Its totient is φ = 289651824.

The previous prime is 442405217. The next prime is 442405259. The reversal of 442405221 is 122504244.

It is a happy number.

It is not a de Polignac number, because 442405221 - 2² = 442405217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 442405191 and 442405200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442405261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66576 + ... + 72918.

It is an arithmetic number, because the mean of its divisors is an integer number (37531104).

Almost surely, 2^442405221 is an apocalyptic number.

It is an amenable number.

442405221 is a deficient number, since it is larger than the sum of its proper divisors (158092443).

442405221 is a wasteful number, since it uses less digits than its factorization.

442405221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6760.

The product of its (nonzero) digits is 2560, while the sum is 24.

The square root of 442405221 is about 21033.4310325253. The cubic root of 442405221 is about 761.9738746632.

Adding to 442405221 its reverse (122504244), we get a palindrome (564909465).

The spelling of 442405221 in words is "four hundred forty-two million, four hundred five thousand, two hundred twenty-one".