442635221 has 8 divisors (see below), whose sum is σ = 518207424. Its totient is φ = 370147680.

The previous prime is 442635173. The next prime is 442635233. The reversal of 442635221 is 122536244.

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

It is a de Polignac number, because none of the positive numbers 2^k-442635221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442635251) 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, 770855 + ... + 771428.

It is an arithmetic number, because the mean of its divisors is an integer number (64775928).

Almost surely, 2^442635221 is an apocalyptic number.

442635221 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

442635221 is a deficient number, since it is larger than the sum of its proper divisors (75572203).

442635221 is a wasteful number, since it uses less digits than its factorization.

442635221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1542331.

The product of its digits is 11520, while the sum is 29.

The square root of 442635221 is about 21038.8978085830. The cubic root of 442635221 is about 762.1058981422.

The spelling of 442635221 in words is "four hundred forty-two million, six hundred thirty-five thousand, two hundred twenty-one".