84955821 has 16 divisors (see below), whose sum is σ = 119447040. Its totient is φ = 53561520.

The previous prime is 84955807. The next prime is 84955861. The reversal of 84955821 is 12855948.

It is a happy number.

It is not a de Polignac number, because 84955821 - 2¹⁹ = 84431533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84955861) 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 in 15 ways as a sum of consecutive naturals, for example, 46006 + ... + 47816.

It is an arithmetic number, because the mean of its divisors is an integer number (7465440).

Almost surely, 2^84955821 is an apocalyptic number.

It is an amenable number.

84955821 is a deficient number, since it is larger than the sum of its proper divisors (34491219).

84955821 is a wasteful number, since it uses less digits than its factorization.

84955821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2656.

The product of its digits is 115200, while the sum is 42.

The square root of 84955821 is about 9217.1482032134. The cubic root of 84955821 is about 439.6067785094.

The spelling of 84955821 in words is "eighty-four million, nine hundred fifty-five thousand, eight hundred twenty-one".