442139 has 2 divisors, whose sum is σ = 442140. Its totient is φ = 442138.

The previous prime is 442121. The next prime is 442147. The reversal of 442139 is 931244.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 442139 - 2¹⁶ = 376603 is a prime.

It is not a weakly prime, because it can be changed into another prime (442109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221069 + 221070.

It is an arithmetic number, because the mean of its divisors is an integer number (221070).

2⁴⁴²¹³⁹ is an apocalyptic number.

442139 is a deficient number, since it is larger than the sum of its proper divisors (1).

442139 is an equidigital number, since it uses as much as digits as its factorization.

442139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

The square root of 442139 is about 664.9353352019. The cubic root of 442139 is about 76.1821002635.

The spelling of 442139 in words is "four hundred forty-two thousand, one hundred thirty-nine".