84219847 has 2 divisors, whose sum is σ = 84219848. Its totient is φ = 84219846.

The previous prime is 84219841. The next prime is 84219931. The reversal of 84219847 is 74891248.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84219847 - 2⁷ = 84219719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84219841) 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, 42109923 + 42109924.

It is an arithmetic number, because the mean of its divisors is an integer number (42109924).

Almost surely, 2^84219847 is an apocalyptic number.

84219847 is a deficient number, since it is larger than the sum of its proper divisors (1).

84219847 is an equidigital number, since it uses as much as digits as its factorization.

84219847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 43.

The square root of 84219847 is about 9177.1371897776. The cubic root of 84219847 is about 438.3336542219. Note that the first 3 decimals are identical.

The spelling of 84219847 in words is "eighty-four million, two hundred nineteen thousand, eight hundred forty-seven".