442857521 has 8 divisors (see below), whose sum is σ = 458446080. Its totient is φ = 427290192.

The previous prime is 442857511. The next prime is 442857533. The reversal of 442857521 is 125758244.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442857521 is a prime.

It is a super-2 number, since 2×442857521² = 392245567812530882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442857511) 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, 45536 + ... + 54398.

It is an arithmetic number, because the mean of its divisors is an integer number (57305760).

Almost surely, 2^442857521 is an apocalyptic number.

It is an amenable number.

442857521 is a deficient number, since it is larger than the sum of its proper divisors (15588559).

442857521 is a wasteful number, since it uses less digits than its factorization.

442857521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10615.

The product of its digits is 89600, while the sum is 38.

The square root of 442857521 is about 21044.1802168676. The cubic root of 442857521 is about 762.2334582486.

The spelling of 442857521 in words is "four hundred forty-two million, eight hundred fifty-seven thousand, five hundred twenty-one".