442440169 has 2 divisors, whose sum is σ = 442440170. Its totient is φ = 442440168.

The previous prime is 442440161. The next prime is 442440179. The reversal of 442440169 is 961044244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 375003225 + 67436944 = 19365^2 + 8212^2 .

It is a cyclic number.

It is not a de Polignac number, because 442440169 - 2³ = 442440161 is a prime.

It is a super-2 number, since 2×442440169² = 391506606289497122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (442440161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221220084 + 221220085.

It is an arithmetic number, because the mean of its divisors is an integer number (221220085).

Almost surely, 2^442440169 is an apocalyptic number.

It is an amenable number.

442440169 is a deficient number, since it is larger than the sum of its proper divisors (1).

442440169 is an equidigital number, since it uses as much as digits as its factorization.

442440169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 442440169 is about 21034.2617888054. The cubic root of 442440169 is about 761.9939382915.

The spelling of 442440169 in words is "four hundred forty-two million, four hundred forty thousand, one hundred sixty-nine".