442839521 has 2 divisors, whose sum is σ = 442839522. Its totient is φ = 442839520.

The previous prime is 442839497. The next prime is 442839547. The reversal of 442839521 is 125938244.

442839521 is nontrivially palindromic in base 5.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 437269921 + 5569600 = 20911^2 + 2360^2 .

It is a cyclic number.

It is not a de Polignac number, because 442839521 - 2²² = 438645217 is a prime.

It is a super-2 number, since 2×442839521² = 392213682719018882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (442839121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221419760 + 221419761.

It is an arithmetic number, because the mean of its divisors is an integer number (221419761).

Almost surely, 2^442839521 is an apocalyptic number.

It is an amenable number.

442839521 is a deficient number, since it is larger than the sum of its proper divisors (1).

442839521 is an equidigital number, since it uses as much as digits as its factorization.

442839521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 38.

The square root of 442839521 is about 21043.7525408374. The cubic root of 442839521 is about 762.2231310836.

The spelling of 442839521 in words is "four hundred forty-two million, eight hundred thirty-nine thousand, five hundred twenty-one".