42084139 has 2 divisors, whose sum is σ = 42084140. Its totient is φ = 42084138.

The previous prime is 42084131. The next prime is 42084151. The reversal of 42084139 is 93148024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42084139 - 2³ = 42084131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42084139.

It is not a weakly prime, because it can be changed into another prime (42084131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21042069 + 21042070.

It is an arithmetic number, because the mean of its divisors is an integer number (21042070).

Almost surely, 2^42084139 is an apocalyptic number.

42084139 is a deficient number, since it is larger than the sum of its proper divisors (1).

42084139 is an equidigital number, since it uses as much as digits as its factorization.

42084139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 42084139 is about 6487.2289153382. The cubic root of 42084139 is about 347.8346282352.

The spelling of 42084139 in words is "forty-two million, eighty-four thousand, one hundred thirty-nine".