84218039 has 2 divisors, whose sum is σ = 84218040. Its totient is φ = 84218038.

The previous prime is 84218027. The next prime is 84218081. The reversal of 84218039 is 93081248.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84218039 - 2⁴ = 84218023 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84218009) 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, 42109019 + 42109020.

It is an arithmetic number, because the mean of its divisors is an integer number (42109020).

Almost surely, 2^84218039 is an apocalyptic number.

84218039 is a deficient number, since it is larger than the sum of its proper divisors (1).

84218039 is an equidigital number, since it uses as much as digits as its factorization.

84218039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 84218039 is about 9177.0386835842. The cubic root of 84218039 is about 438.3305175387.

It can be divided in two parts, 842 and 18039, that added together give a palindrome (18881).

The spelling of 84218039 in words is "eighty-four million, two hundred eighteen thousand, thirty-nine".