442228721 has 8 divisors (see below), whose sum is σ = 482584800. Its totient is φ = 401898240.

The previous prime is 442228691. The next prime is 442228729. The reversal of 442228721 is 127822244.

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

It is a cyclic number.

It is not a de Polignac number, because 442228721 - 2¹⁰ = 442227697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442228729) 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, 57650 + ... + 64868.

It is an arithmetic number, because the mean of its divisors is an integer number (60323100).

Almost surely, 2^442228721 is an apocalyptic number.

It is an amenable number.

442228721 is a deficient number, since it is larger than the sum of its proper divisors (40356079).

442228721 is a wasteful number, since it uses less digits than its factorization.

442228721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12799.

The product of its digits is 14336, while the sum is 32.

The square root of 442228721 is about 21029.2349123785. The cubic root of 442228721 is about 761.8725299597.

The spelling of 442228721 in words is "four hundred forty-two million, two hundred twenty-eight thousand, seven hundred twenty-one".