84855847 has 2 divisors, whose sum is σ = 84855848. Its totient is φ = 84855846.

The previous prime is 84855839. The next prime is 84855851. The reversal of 84855847 is 74855848.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84855847 - 2³ = 84855839 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84855847.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84855817) 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, 42427923 + 42427924.

It is an arithmetic number, because the mean of its divisors is an integer number (42427924).

Almost surely, 2^84855847 is an apocalyptic number.

84855847 is a deficient number, since it is larger than the sum of its proper divisors (1).

84855847 is an equidigital number, since it uses as much as digits as its factorization.

84855847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1433600, while the sum is 49.

The square root of 84855847 is about 9211.7233458241. The cubic root of 84855847 is about 439.4342712057.

Subtracting from 84855847 its reverse (74855848), we obtain a palindrome (9999999).

The spelling of 84855847 in words is "eighty-four million, eight hundred fifty-five thousand, eight hundred forty-seven".