84219439 has 2 divisors, whose sum is σ = 84219440. Its totient is φ = 84219438.

The previous prime is 84219431. The next prime is 84219461. The reversal of 84219439 is 93491248.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84219439 - 2³ = 84219431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84219431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42109719 + 42109720.

It is an arithmetic number, because the mean of its divisors is an integer number (42109720).

Almost surely, 2^84219439 is an apocalyptic number.

84219439 is a deficient number, since it is larger than the sum of its proper divisors (1).

84219439 is an equidigital number, since it uses as much as digits as its factorization.

84219439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 84219439 is about 9177.1149605963. The cubic root of 84219439 is about 438.3329463902.

The spelling of 84219439 in words is "eighty-four million, two hundred nineteen thousand, four hundred thirty-nine".