442921 has 8 divisors (see below), whose sum is σ = 462024. Its totient is φ = 424320.

The previous prime is 442919. The next prime is 442961. The reversal of 442921 is 129244.

It can be written as a sum of positive squares in 4 ways, for example, as 26896 + 416025 = 164^2 + 645^2 .

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 442921 - 2¹ = 442919 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 442892 and 442901.

It is not an unprimeable number, because it can be changed into a prime (442961) 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, 3165 + ... + 3301.

It is an arithmetic number, because the mean of its divisors is an integer number (57753).

2⁴⁴²⁹²¹ is an apocalyptic number.

It is an amenable number.

442921 is a deficient number, since it is larger than the sum of its proper divisors (19103).

442921 is a wasteful number, since it uses less digits than its factorization.

442921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251.

The product of its digits is 576, while the sum is 22.

The square root of 442921 is about 665.5231025291. The cubic root of 442921 is about 76.2269875910.

The spelling of 442921 in words is "four hundred forty-two thousand, nine hundred twenty-one".