442878439 has 2 divisors, whose sum is σ = 442878440. Its totient is φ = 442878438.

The previous prime is 442878427. The next prime is 442878463. The reversal of 442878439 is 934878244.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 442878439 - 2⁷ = 442878311 is a prime.

It is a super-2 number, since 2×442878439² = 392282623462153442, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 442878392 and 442878401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442878479) 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, 221439219 + 221439220.

It is an arithmetic number, because the mean of its divisors is an integer number (221439220).

Almost surely, 2^442878439 is an apocalyptic number.

442878439 is a deficient number, since it is larger than the sum of its proper divisors (1).

442878439 is an equidigital number, since it uses as much as digits as its factorization.

442878439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1548288, while the sum is 49.

The square root of 442878439 is about 21044.6772130152. The cubic root of 442878439 is about 762.2454592103.

The spelling of 442878439 in words is "four hundred forty-two million, eight hundred seventy-eight thousand, four hundred thirty-nine".