442521218 has 8 divisors (see below), whose sum is σ = 685194240. Its totient is φ = 214123140.

The previous prime is 442521217. The next prime is 442521239. The reversal of 442521218 is 812125244.

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

It is not an unprimeable number, because it can be changed into a prime (442521217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3568658 + ... + 3568781.

It is an arithmetic number, because the mean of its divisors is an integer number (85649280).

Almost surely, 2^442521218 is an apocalyptic number.

442521218 is a deficient number, since it is larger than the sum of its proper divisors (242673022).

442521218 is a wasteful number, since it uses less digits than its factorization.

442521218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7137472.

The product of its digits is 5120, while the sum is 29.

The square root of 442521218 is about 21036.1882954113. The cubic root of 442521218 is about 762.0404644136.

The spelling of 442521218 in words is "four hundred forty-two million, five hundred twenty-one thousand, two hundred eighteen".